[llvm] [DWARFLinker] Allow emission of repeated identical discriminators (PR #98255)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `sanitizer-aarch64-linux-bootstrap-asan` running on `sanitizer-buildbot8` while building `llvm` at step 2 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/24/builds/427

Here is the relevant piece of the build log for the reference:
```
Step 2 (annotate) failure: 'python ../sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/buildbot_selector.py' (failure)
...
-- Performing Test COMPILER_RT_TARGET_HAS_ATOMICS - Success
-- Performing Test COMPILER_RT_TARGET_HAS_FCNTL_LCK
-- Performing Test COMPILER_RT_TARGET_HAS_FCNTL_LCK - Success
-- Performing Test COMPILER_RT_TARGET_HAS_UNAME
-- Performing Test COMPILER_RT_TARGET_HAS_UNAME - Success
-- Performing Test HAS_THREAD_LOCAL
-- Performing Test HAS_THREAD_LOCAL - Success
-- Generated Sanitizer SUPPORTED_TOOLS list on "Linux" is "asan;lsan;hwasan;msan;tsan;ubsan"
-- sanitizer_common tests on "Linux" will run against "asan;lsan;hwasan;msan;tsan;ubsan"
-- Configuring incomplete, errors occurred!
FAILED: runtimes/runtimes-stamps/runtimes-configure /b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/runtimes/runtimes-stamps/runtimes-configure 
cd /b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/runtimes/runtimes-bins && /usr/bin/cmake --no-warn-unused-cli -DCMAKE_C_COMPILER=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/clang -DCMAKE_CXX_COMPILER=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/clang++ -DCMAKE_ASM_COMPILER=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/clang -DCMAKE_LINKER=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/ld.lld -DCMAKE_AR=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/llvm-ar -DCMAKE_RANLIB=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/llvm-ranlib -DCMAKE_NM=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/llvm-nm -DCMAKE_OBJDUMP=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/llvm-objdump -DCMAKE_OBJCOPY=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/llvm-objcopy -DCMAKE_STRIP=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/llvm-strip -DCMAKE_READELF=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/llvm-readelf -DCMAKE_C_COMPILER_TARGET=aarch64-unknown-linux-gnu -DCMAKE_CXX_COMPILER_TARGET=aarch64-unknown-linux-gnu -DCMAKE_ASM_COMPILER_TARGET=aarch64-unknown-linux-gnu -DCMAKE_INSTALL_PREFIX=/usr/local -DLLVM_BINARY_DIR=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0 -DLLVM_CONFIG_PATH=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/bin/llvm-config -DLLVM_ENABLE_WERROR=OFF -DLLVM_HOST_TRIPLE=aarch64-unknown-linux-gnu -DLLVM_HAVE_LINK_VERSION_SCRIPT=1 -DLLVM_USE_RELATIVE_PATHS_IN_DEBUG_INFO=OFF -DLLVM_USE_RELATIVE_PATHS_IN_FILES=OFF -DLLVM_LIT_ARGS=-sv -DLLVM_SOURCE_PREFIX= -DPACKAGE_VERSION=19.0.0git -DCMAKE_BUILD_TYPE=Release -DCMAKE_MAKE_PROGRAM=/usr/bin/ninja -DCMAKE_EXPORT_COMPILE_COMMANDS=1 -DCOMPILER_RT_BUILD_BUILTINS=Off -DLLVM_INCLUDE_TESTS=ON -DLLVM_DEFAULT_TARGET_TRIPLE=aarch64-unknown-linux-gnu -DLLVM_ENABLE_PROJECTS_USED=ON -DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=OFF -DLLVM_BUILD_TOOLS=ON -DCMAKE_C_COMPILER_WORKS=ON -DCMAKE_CXX_COMPILER_WORKS=ON -DCMAKE_ASM_COMPILER_WORKS=ON -DHAVE_LLVM_LIT=ON -DCLANG_RESOURCE_DIR= "-DLLVM_ENABLE_RUNTIMES=compiler-rt;libunwind;libcxx;libcxxabi" -DLLVM_USE_LINKER=lld -DLIBCXX_HARDENING_MODE=extensive -GNinja -S /b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/runtimes/../../runtimes -B /b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/runtimes/runtimes-bins && /usr/bin/cmake -E touch /b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/runtimes/runtimes-stamps/runtimes-configure
ninja: build stopped: subcommand failed.
+ touch llvm_build0/delete_next_time
+ return 1
Step 7 (stage1 build all) failure: stage1 build all (failure)
...
-- Performing Test COMPILER_RT_TARGET_HAS_ATOMICS - Success
-- Performing Test COMPILER_RT_TARGET_HAS_FCNTL_LCK
-- Performing Test COMPILER_RT_TARGET_HAS_FCNTL_LCK - Success
-- Performing Test COMPILER_RT_TARGET_HAS_UNAME
-- Performing Test COMPILER_RT_TARGET_HAS_UNAME - Success
-- Performing Test HAS_THREAD_LOCAL
-- Performing Test HAS_THREAD_LOCAL - Success
-- Generated Sanitizer SUPPORTED_TOOLS list on "Linux" is "asan;lsan;hwasan;msan;tsan;ubsan"
-- sanitizer_common tests on "Linux" will run against "asan;lsan;hwasan;msan;tsan;ubsan"
-- Configuring incomplete, errors occurred!
FAILED: runtimes/runtimes-stamps/runtimes-configure /b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/runtimes/runtimes-stamps/runtimes-configure 
cd /b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/runtimes/runtimes-bins && /usr/bin/cmake --no-warn-unused-cli -DCMAKE_C_COMPILER=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/clang -DCMAKE_CXX_COMPILER=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/clang++ -DCMAKE_ASM_COMPILER=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/clang -DCMAKE_LINKER=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/ld.lld -DCMAKE_AR=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/llvm-ar -DCMAKE_RANLIB=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/llvm-ranlib -DCMAKE_NM=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/llvm-nm -DCMAKE_OBJDUMP=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/llvm-objdump -DCMAKE_OBJCOPY=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/llvm-objcopy -DCMAKE_STRIP=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/llvm-strip -DCMAKE_READELF=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/./bin/llvm-readelf -DCMAKE_C_COMPILER_TARGET=aarch64-unknown-linux-gnu -DCMAKE_CXX_COMPILER_TARGET=aarch64-unknown-linux-gnu -DCMAKE_ASM_COMPILER_TARGET=aarch64-unknown-linux-gnu -DCMAKE_INSTALL_PREFIX=/usr/local -DLLVM_BINARY_DIR=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0 -DLLVM_CONFIG_PATH=/b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/bin/llvm-config -DLLVM_ENABLE_WERROR=OFF -DLLVM_HOST_TRIPLE=aarch64-unknown-linux-gnu -DLLVM_HAVE_LINK_VERSION_SCRIPT=1 -DLLVM_USE_RELATIVE_PATHS_IN_DEBUG_INFO=OFF -DLLVM_USE_RELATIVE_PATHS_IN_FILES=OFF -DLLVM_LIT_ARGS=-sv -DLLVM_SOURCE_PREFIX= -DPACKAGE_VERSION=19.0.0git -DCMAKE_BUILD_TYPE=Release -DCMAKE_MAKE_PROGRAM=/usr/bin/ninja -DCMAKE_EXPORT_COMPILE_COMMANDS=1 -DCOMPILER_RT_BUILD_BUILTINS=Off -DLLVM_INCLUDE_TESTS=ON -DLLVM_DEFAULT_TARGET_TRIPLE=aarch64-unknown-linux-gnu -DLLVM_ENABLE_PROJECTS_USED=ON -DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=OFF -DLLVM_BUILD_TOOLS=ON -DCMAKE_C_COMPILER_WORKS=ON -DCMAKE_CXX_COMPILER_WORKS=ON -DCMAKE_ASM_COMPILER_WORKS=ON -DHAVE_LLVM_LIT=ON -DCLANG_RESOURCE_DIR= "-DLLVM_ENABLE_RUNTIMES=compiler-rt;libunwind;libcxx;libcxxabi" -DLLVM_USE_LINKER=lld -DLIBCXX_HARDENING_MODE=extensive -GNinja -S /b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm-project/llvm/runtimes/../../runtimes -B /b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/runtimes/runtimes-bins && /usr/bin/cmake -E touch /b/sanitizer-aarch64-linux-bootstrap-asan/build/llvm_build0/runtimes/runtimes-stamps/runtimes-configure
ninja: build stopped: subcommand failed.
+ touch llvm_build0/delete_next_time
+ return 1
program finished with exit code 1
elapsedTime=1841.984140

```

https://github.com/llvm/llvm-project/pull/98255