[llvm] [ControlHeightReduction] Add assert to avoid underflow (PR #116339)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-aarch64-sve-vla-2stage` running on `linaro-g3-02` while building `llvm` at step 11 "build stage 2".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/41/builds/3585

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 11 (build stage 2) failure: 'ninja' (failure)
...
[7891/8757] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/unparse.cpp.o
[7892/8757] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/executable-parsers.cpp.o
[7893/8757] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/canonicalize-directives.cpp.o
[7894/8757] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/canonicalize-acc.cpp.o
[7895/8757] Building CXX object tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/ComponentPath.cpp.o
[7896/8757] Building CXX object tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/HlfirIntrinsics.cpp.o
[7897/8757] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-if-stmt.cpp.o
[7898/8757] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/openmp-parsers.cpp.o
[7899/8757] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-arithmeticif.cpp.o
[7900/8757] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-cuda.cpp.o
FAILED: tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-cuda.cpp.o 
/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage1.install/bin/clang++ -DFLANG_INCLUDE_TESTS=1 -DFLANG_LITTLE_ENDIAN=1 -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/flang/lib/Semantics -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/lib/Semantics -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/../mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/clang/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/../clang/include -mcpu=neoverse-512tvb -mllvm -scalable-vectorization=preferred -mllvm -treat-scalable-fixed-error-as-warning=false -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Wno-deprecated-copy -Wno-string-conversion -Wno-ctad-maybe-unsupported -Wno-unused-command-line-argument -Wstring-conversion           -Wcovered-switch-default -Wno-nested-anon-types -O3 -DNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-cuda.cpp.o -MF tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-cuda.cpp.o.d -o tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-cuda.cpp.o -c /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/lib/Semantics/check-cuda.cpp
Killed
[7901/8757] Building CXX object tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/PFTBuilder.cpp.o
FAILED: tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/PFTBuilder.cpp.o 
/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage1.install/bin/clang++ -DFLANG_INCLUDE_TESTS=1 -DFLANG_LITTLE_ENDIAN=1 -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/../mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/clang/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/../clang/include -mcpu=neoverse-512tvb -mllvm -scalable-vectorization=preferred -mllvm -treat-scalable-fixed-error-as-warning=false -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Wno-deprecated-copy -Wno-string-conversion -Wno-ctad-maybe-unsupported -Wno-unused-command-line-argument -Wstring-conversion           -Wcovered-switch-default -Wno-nested-anon-types -O3 -DNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/PFTBuilder.cpp.o -MF tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/PFTBuilder.cpp.o.d -o tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/PFTBuilder.cpp.o -c /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/lib/Lower/PFTBuilder.cpp
Killed
[7902/8757] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-omp-structure.cpp.o
FAILED: tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-omp-structure.cpp.o 
/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage1.install/bin/clang++ -DFLANG_INCLUDE_TESTS=1 -DFLANG_LITTLE_ENDIAN=1 -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/flang/lib/Semantics -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/lib/Semantics -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/../mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/clang/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/../clang/include -mcpu=neoverse-512tvb -mllvm -scalable-vectorization=preferred -mllvm -treat-scalable-fixed-error-as-warning=false -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Wno-deprecated-copy -Wno-string-conversion -Wno-ctad-maybe-unsupported -Wno-unused-command-line-argument -Wstring-conversion           -Wcovered-switch-default -Wno-nested-anon-types -O3 -DNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-omp-structure.cpp.o -MF tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-omp-structure.cpp.o.d -o tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-omp-structure.cpp.o -c /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/lib/Semantics/check-omp-structure.cpp
Killed
[7903/8757] Building CXX object tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/OpenMP/OpenMP.cpp.o
FAILED: tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/OpenMP/OpenMP.cpp.o 
/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage1.install/bin/clang++ -DFLANG_INCLUDE_TESTS=1 -DFLANG_LITTLE_ENDIAN=1 -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/../mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/clang/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/../clang/include -mcpu=neoverse-512tvb -mllvm -scalable-vectorization=preferred -mllvm -treat-scalable-fixed-error-as-warning=false -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Wno-deprecated-copy -Wno-string-conversion -Wno-ctad-maybe-unsupported -Wno-unused-command-line-argument -Wstring-conversion           -Wcovered-switch-default -Wno-nested-anon-types -O3 -DNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/OpenMP/OpenMP.cpp.o -MF tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/OpenMP/OpenMP.cpp.o.d -o tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/OpenMP/OpenMP.cpp.o -c /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/lib/Lower/OpenMP/OpenMP.cpp
Killed
[7904/8757] Building CXX object tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/ConvertType.cpp.o
FAILED: tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/ConvertType.cpp.o 
/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage1.install/bin/clang++ -DFLANG_INCLUDE_TESTS=1 -DFLANG_LITTLE_ENDIAN=1 -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/../mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/clang/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/../clang/include -mcpu=neoverse-512tvb -mllvm -scalable-vectorization=preferred -mllvm -treat-scalable-fixed-error-as-warning=false -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Wno-deprecated-copy -Wno-string-conversion -Wno-ctad-maybe-unsupported -Wno-unused-command-line-argument -Wstring-conversion           -Wcovered-switch-default -Wno-nested-anon-types -O3 -DNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/ConvertType.cpp.o -MF tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/ConvertType.cpp.o.d -o tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/ConvertType.cpp.o -c /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/lib/Lower/ConvertType.cpp
Killed
[7905/8757] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/openmp-modifiers.cpp.o
[7906/8757] Building CXX object tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/IO.cpp.o
FAILED: tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/IO.cpp.o 
/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage1.install/bin/clang++ -DFLANG_INCLUDE_TESTS=1 -DFLANG_LITTLE_ENDIAN=1 -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/lib/Lower -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/../mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/clang/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/../clang/include -mcpu=neoverse-512tvb -mllvm -scalable-vectorization=preferred -mllvm -treat-scalable-fixed-error-as-warning=false -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Wno-deprecated-copy -Wno-string-conversion -Wno-ctad-maybe-unsupported -Wno-unused-command-line-argument -Wstring-conversion           -Wcovered-switch-default -Wno-nested-anon-types -O3 -DNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/IO.cpp.o -MF tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/IO.cpp.o.d -o tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/IO.cpp.o -c /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/lib/Lower/IO.cpp
Killed
[7907/8757] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-io.cpp.o
FAILED: tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-io.cpp.o 
/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage1.install/bin/clang++ -DFLANG_INCLUDE_TESTS=1 -DFLANG_LITTLE_ENDIAN=1 -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/flang/lib/Semantics -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/lib/Semantics -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/flang/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/../mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/mlir/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage2/tools/clang/include -isystem /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/llvm/../clang/include -mcpu=neoverse-512tvb -mllvm -scalable-vectorization=preferred -mllvm -treat-scalable-fixed-error-as-warning=false -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Wno-deprecated-copy -Wno-string-conversion -Wno-ctad-maybe-unsupported -Wno-unused-command-line-argument -Wstring-conversion           -Wcovered-switch-default -Wno-nested-anon-types -O3 -DNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-io.cpp.o -MF tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-io.cpp.o.d -o tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-io.cpp.o -c /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/llvm/flang/lib/Semantics/check-io.cpp
Killed
[7908/8757] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/pointer-assignment.cpp.o
[7909/8757] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/program-tree.cpp.o
[7910/8757] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-namelist.cpp.o
[7911/8757] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-stop.cpp.o
[7912/8757] Building CXX object tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/VectorSubscripts.cpp.o
[7913/8757] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-purity.cpp.o
[7914/8757] Building CXX object tools/flang/lib/Lower/CMakeFiles/FortranLower.dir/ConvertExprToHLFIR.cpp.o
[7915/8757] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-return.cpp.o
[7916/8757] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-case.cpp.o
[7917/8757] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/compute-offsets.cpp.o
[7918/8757] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/check-allocate.cpp.o

```

</details>

https://github.com/llvm/llvm-project/pull/116339