[llvm] [SandboxVec][Scheduler] Forbid crossing BBs (PR #124369)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `flang-aarch64-dylib` running on `linaro-flang-aarch64-dylib` while building `llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/50/builds/9403

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
811.895 [1803/6/5013] Building CXX object tools/mlir/lib/Dialect/AMDGPU/Transforms/CMakeFiles/obj.MLIRAMDGPUTransforms.dir/EmulateAtomics.cpp.o
812.067 [1803/5/5014] Building CXX object tools/mlir/lib/Dialect/Tosa/CMakeFiles/obj.MLIRTosaDialect.dir/Utils/QuantUtils.cpp.o
812.079 [1803/4/5015] Building CXX object tools/mlir/lib/Dialect/Arith/IR/CMakeFiles/obj.MLIRArithValueBoundsOpInterfaceImpl.dir/ValueBoundsOpInterfaceImpl.cpp.o
812.103 [1803/3/5016] Building CXX object tools/mlir/lib/Dialect/Tosa/CMakeFiles/obj.MLIRTosaDialect.dir/Utils/ConversionUtils.cpp.o
812.191 [1799/6/5017] Building CXX object tools/mlir/lib/Dialect/AMX/Transforms/CMakeFiles/obj.MLIRAMXTransforms.dir/LegalizeForLLVMExport.cpp.o
812.250 [1799/5/5018] Building CXX object tools/mlir/lib/Dialect/Transform/PDLExtension/CMakeFiles/obj.MLIRTransformPDLExtension.dir/PDLExtension.cpp.o
812.251 [1799/4/5019] Building CXX object tools/mlir/lib/Dialect/Arith/Transforms/CMakeFiles/obj.MLIRArithTransforms.dir/BufferViewFlowOpInterfaceImpl.cpp.o
812.315 [1799/3/5020] Building CXX object tools/mlir/lib/Dialect/Arith/Transforms/CMakeFiles/obj.MLIRArithTransforms.dir/ReifyValueBounds.cpp.o
812.316 [1799/2/5021] Building CXX object tools/mlir/lib/Dialect/Arith/IR/CMakeFiles/obj.MLIRArithDialect.dir/ArithDialect.cpp.o
815.423 [1799/1/5022] Building CXX object tools/mlir/test/lib/IR/CMakeFiles/MLIRTestIR.dir/TestVisitorsGeneric.cpp.o
FAILED: tools/mlir/test/lib/IR/CMakeFiles/MLIRTestIR.dir/TestVisitorsGeneric.cpp.o 
/usr/local/bin/c++ -DGTEST_HAS_RTTI=0 -DMLIR_INCLUDE_TESTS -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/flang-aarch64-dylib/build/tools/mlir/test/lib/IR -I/home/tcwg-buildbot/worker/flang-aarch64-dylib/llvm-project/mlir/test/lib/IR -I/home/tcwg-buildbot/worker/flang-aarch64-dylib/build/tools/mlir/include -I/home/tcwg-buildbot/worker/flang-aarch64-dylib/llvm-project/mlir/include -I/home/tcwg-buildbot/worker/flang-aarch64-dylib/build/include -I/home/tcwg-buildbot/worker/flang-aarch64-dylib/llvm-project/llvm/include -I/home/tcwg-buildbot/worker/flang-aarch64-dylib/llvm-project/mlir/test/lib/IR/../Dialect/Test -I/home/tcwg-buildbot/worker/flang-aarch64-dylib/build/tools/mlir/test/lib/IR/../Dialect/Test -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 -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Wundef -Werror=mismatched-tags -O3 -DNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT tools/mlir/test/lib/IR/CMakeFiles/MLIRTestIR.dir/TestVisitorsGeneric.cpp.o -MF tools/mlir/test/lib/IR/CMakeFiles/MLIRTestIR.dir/TestVisitorsGeneric.cpp.o.d -o tools/mlir/test/lib/IR/CMakeFiles/MLIRTestIR.dir/TestVisitorsGeneric.cpp.o -c /home/tcwg-buildbot/worker/flang-aarch64-dylib/llvm-project/mlir/test/lib/IR/TestVisitorsGeneric.cpp
In file included from /home/tcwg-buildbot/worker/flang-aarch64-dylib/llvm-project/mlir/test/lib/IR/TestVisitorsGeneric.cpp:9:
/home/tcwg-buildbot/worker/flang-aarch64-dylib/llvm-project/mlir/test/lib/IR/../Dialect/Test/TestOps.h:148:10: fatal error: 'TestOps.h.inc' file not found
  148 | #include "TestOps.h.inc"
      |          ^~~~~~~~~~~~~~~
1 error generated.
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/124369