[llvm] [AtomicExpandPass] Match isIdempotentRMW with InstcombineRMW (PR #142277)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `sanitizer-aarch64-linux-bootstrap-msan` running on `sanitizer-buildbot9` while building `llvm` at step 2 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/94/builds/7853

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

```
Step 2 (annotate) failure: 'python ../sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/buildbot_selector.py' (failure)
...
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using ld.lld: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/ld.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/llvm/utils/lit/lit/main.py:73: note: The test suite configuration requested an individual test timeout of 0 seconds but a timeout of 900 seconds was requested on the command line. Forcing timeout to be 900 seconds.
-- Testing: 87877 tests, 72 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.
FAIL: lld :: COFF/sort-debug.test (85183 of 87877)
******************** TEST 'lld :: COFF/sort-debug.test' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
/home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/yaml2obj /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/lld/test/COFF/sort-debug.test -o /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/tools/lld/test/COFF/Output/sort-debug.test.tmp.obj # RUN: at line 1
+ /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/yaml2obj /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/lld/test/COFF/sort-debug.test -o /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/tools/lld/test/COFF/Output/sort-debug.test.tmp.obj
/home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/lld-link /debug /out:/home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/tools/lld/test/COFF/Output/sort-debug.test.tmp.exe /entry:main /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/tools/lld/test/COFF/Output/sort-debug.test.tmp.obj # RUN: at line 2
+ /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/lld-link /debug /out:/home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/tools/lld/test/COFF/Output/sort-debug.test.tmp.exe /entry:main /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/tools/lld/test/COFF/Output/sort-debug.test.tmp.obj
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.

--

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.. 
Slowest Tests:
--------------------------------------------------------------------------
64.19s: Clang :: Driver/fsanitize.c
44.94s: LLVM :: CodeGen/AMDGPU/amdgcn.bitcast.1024bit.ll
44.10s: Clang :: Preprocessor/riscv-target-features.c
41.44s: Clang :: Driver/arm-cortex-cpus-2.c
40.48s: Clang :: Driver/arm-cortex-cpus-1.c
36.84s: Clang :: OpenMP/target_defaultmap_codegen_01.cpp
36.63s: LLVM :: CodeGen/AMDGPU/memintrinsic-unroll.ll
34.64s: Clang :: OpenMP/target_update_codegen.cpp
31.49s: LLVM :: CodeGen/AMDGPU/sched-group-barrier-pipeline-solver.mir
30.94s: Clang :: Preprocessor/aarch64-target-features.c
30.07s: Clang :: Preprocessor/arm-target-features.c
28.74s: LLVM :: CodeGen/RISCV/attributes.ll
27.46s: Clang :: CodeGen/AArch64/sve-intrinsics/acle_sve_reinterpret.c
26.77s: Clang :: Driver/linux-ld.c
26.17s: LLVM :: CodeGen/ARM/build-attributes.ll
26.02s: Clang :: Driver/clang_f_opts.c
25.88s: LLVM :: MC/Mips/mips-jump-pc-region.s
25.31s: Clang :: Driver/cl-options.c
23.98s: Clang :: Preprocessor/predefined-arch-macros.c
23.84s: LLVM :: tools/llvm-reduce/parallel-workitem-kill.ll

Step 11 (stage2/msan check) failure: stage2/msan check (failure)
...
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using ld.lld: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/ld.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using lld-link: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/lld-link
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using ld64.lld: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/ld64.lld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/llvm/utils/lit/lit/llvm/config.py:520: note: using wasm-ld: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/wasm-ld
llvm-lit: /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/llvm/utils/lit/lit/main.py:73: note: The test suite configuration requested an individual test timeout of 0 seconds but a timeout of 900 seconds was requested on the command line. Forcing timeout to be 900 seconds.
-- Testing: 87877 tests, 72 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.
FAIL: lld :: COFF/sort-debug.test (85183 of 87877)
******************** TEST 'lld :: COFF/sort-debug.test' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
/home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/yaml2obj /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/lld/test/COFF/sort-debug.test -o /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/tools/lld/test/COFF/Output/sort-debug.test.tmp.obj # RUN: at line 1
+ /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/yaml2obj /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm-project/lld/test/COFF/sort-debug.test -o /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/tools/lld/test/COFF/Output/sort-debug.test.tmp.obj
/home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/lld-link /debug /out:/home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/tools/lld/test/COFF/Output/sort-debug.test.tmp.exe /entry:main /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/tools/lld/test/COFF/Output/sort-debug.test.tmp.obj # RUN: at line 2
+ /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/bin/lld-link /debug /out:/home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/tools/lld/test/COFF/Output/sort-debug.test.tmp.exe /entry:main /home/b/sanitizer-aarch64-linux-bootstrap-msan/build/llvm_build_msan/tools/lld/test/COFF/Output/sort-debug.test.tmp.obj
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.

--

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.. 
Slowest Tests:
--------------------------------------------------------------------------
64.19s: Clang :: Driver/fsanitize.c
44.94s: LLVM :: CodeGen/AMDGPU/amdgcn.bitcast.1024bit.ll
44.10s: Clang :: Preprocessor/riscv-target-features.c
41.44s: Clang :: Driver/arm-cortex-cpus-2.c
40.48s: Clang :: Driver/arm-cortex-cpus-1.c
36.84s: Clang :: OpenMP/target_defaultmap_codegen_01.cpp
36.63s: LLVM :: CodeGen/AMDGPU/memintrinsic-unroll.ll
34.64s: Clang :: OpenMP/target_update_codegen.cpp
31.49s: LLVM :: CodeGen/AMDGPU/sched-group-barrier-pipeline-solver.mir
30.94s: Clang :: Preprocessor/aarch64-target-features.c
30.07s: Clang :: Preprocessor/arm-target-features.c
28.74s: LLVM :: CodeGen/RISCV/attributes.ll
27.46s: Clang :: CodeGen/AArch64/sve-intrinsics/acle_sve_reinterpret.c
26.77s: Clang :: Driver/linux-ld.c
26.17s: LLVM :: CodeGen/ARM/build-attributes.ll
26.02s: Clang :: Driver/clang_f_opts.c
25.88s: LLVM :: MC/Mips/mips-jump-pc-region.s
25.31s: Clang :: Driver/cl-options.c
23.98s: Clang :: Preprocessor/predefined-arch-macros.c
23.84s: LLVM :: tools/llvm-reduce/parallel-workitem-kill.ll


```

</details>

https://github.com/llvm/llvm-project/pull/142277