[llvm] [RISCV] Ignore debug instructions in epilogue block checks (PR #219401)

[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/20972

<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) (timed out)
...
[8805/8839] Linking CXX executable bin/sancov
[8806/8839] Building CXX object tools/mlir/lib/CAPI/Conversion/CMakeFiles/obj.MLIRCAPIConversion.dir/Passes.cpp.o
[8807/8839] Building CXX object tools/llvm-jitlink/CMakeFiles/llvm-jitlink.dir/llvm-jitlink.cpp.o
[8808/8839] Linking CXX executable bin/llvm-jitlink
[8809/8839] Building CXX object tools/obj2yaml/CMakeFiles/obj2yaml.dir/elf2yaml.cpp.o
[8810/8839] Linking CXX executable bin/obj2yaml
[8811/8839] Building CXX object tools/clang/lib/ASTMatchers/Dynamic/CMakeFiles/obj.clangDynamicASTMatchers.dir/Registry.cpp.o
[8812/8839] Linking CXX static library lib/libclangDynamicASTMatchers.a
[8813/8839] Linking CXX shared library lib/libclang-cpp.so.24.0git
[8814/8839] Creating library symlink lib/libclang-cpp.so
command timed out: 1200 seconds without output running [b'python', b'../sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/buildbot_selector.py'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=2346.854414
Step 9 (stage2/msan build) failure: stage2/msan build (failure)
...
[8770/8839] Linking CXX executable bin/llvm-tli-checker
[8771/8839] Building CXX object tools/llvm-split/CMakeFiles/llvm-split.dir/llvm-split.cpp.o
[8772/8839] Linking CXX executable bin/llvm-lto2
[8773/8839] Building CXX object tools/obj2yaml/CMakeFiles/obj2yaml.dir/wasm2yaml.cpp.o
[8774/8839] Building CXX object tools/yaml2obj/CMakeFiles/yaml2obj.dir/yaml2obj.cpp.o
[8775/8839] Building CXX object tools/llvm-pdbutil/CMakeFiles/llvm-pdbutil.dir/llvm-pdbutil.cpp.o
[8776/8839] Building CXX object tools/llvm-rtdyld/CMakeFiles/llvm-rtdyld.dir/llvm-rtdyld.cpp.o
[8777/8839] Linking CXX executable bin/yaml2obj
[8778/8839] Building CXX object tools/obj2yaml/CMakeFiles/obj2yaml.dir/goff2yaml.cpp.o
[8779/8839] Building CXX object tools/verify-uselistorder/CMakeFiles/verify-uselistorder.dir/verify-uselistorder.cpp.o
[8780/8839] Building CXX object tools/llvm-reduce/CMakeFiles/llvm-reduce.dir/deltas/RunIRPasses.cpp.o
[8781/8839] Linking CXX executable bin/llvm-rtdyld
[8782/8839] Linking CXX executable bin/verify-uselistorder
[8783/8839] Building CXX object tools/llvm-stress/CMakeFiles/llvm-stress.dir/llvm-stress.cpp.o
[8784/8839] Linking CXX executable bin/llvm-stress
[8785/8839] Building CXX object tools/llvm-profgen/CMakeFiles/llvm-profgen.dir/CSPreInliner.cpp.o
[8786/8839] Building CXX object tools/llvm-xray/CMakeFiles/llvm-xray.dir/xray-graph.cpp.o
[8787/8839] Linking CXX executable bin/llvm-split
[8788/8839] Building CXX object tools/llvm-xray/CMakeFiles/llvm-xray.dir/xray-converter.cpp.o
[8789/8839] Building CXX object tools/llvm-profgen/CMakeFiles/llvm-profgen.dir/PerfReader.cpp.o
[8790/8839] Building CXX object tools/mlir/lib/ExecutionEngine/CMakeFiles/mlir_c_runner_utils.dir/SparseTensorRuntime.cpp.o
[8791/8839] Linking CXX shared library lib/libmlir_c_runner_utils.so.24.0git
[8792/8839] Creating library symlink lib/libmlir_c_runner_utils.so
[8793/8839] Building CXX object tools/llvm-xray/CMakeFiles/llvm-xray.dir/xray-stacks.cpp.o
[8794/8839] Building CXX object tools/llvm-profgen/CMakeFiles/llvm-profgen.dir/ProfiledBinary.cpp.o
[8795/8839] Building CXX object tools/llvm-pdbutil/CMakeFiles/llvm-pdbutil.dir/DumpOutputStyle.cpp.o
[8796/8839] Linking CXX executable bin/llvm-pdbutil
[8797/8839] Building CXX object tools/llvm-reduce/CMakeFiles/llvm-reduce.dir/ReducerWorkItem.cpp.o
[8798/8839] Building CXX object tools/obj2yaml/CMakeFiles/obj2yaml.dir/macho2yaml.cpp.o
[8799/8839] Linking CXX executable bin/llvm-reduce
[8800/8839] Building CXX object tools/llvm-profgen/CMakeFiles/llvm-profgen.dir/ProfileGenerator.cpp.o
[8801/8839] Building CXX object tools/llvm-xray/CMakeFiles/llvm-xray.dir/xray-account.cpp.o
[8802/8839] Linking CXX executable bin/llvm-xray
[8803/8839] Linking CXX executable bin/llvm-profgen
[8804/8839] Building CXX object tools/sancov/CMakeFiles/sancov.dir/sancov.cpp.o
[8805/8839] Linking CXX executable bin/sancov
[8806/8839] Building CXX object tools/mlir/lib/CAPI/Conversion/CMakeFiles/obj.MLIRCAPIConversion.dir/Passes.cpp.o
[8807/8839] Building CXX object tools/llvm-jitlink/CMakeFiles/llvm-jitlink.dir/llvm-jitlink.cpp.o
[8808/8839] Linking CXX executable bin/llvm-jitlink
[8809/8839] Building CXX object tools/obj2yaml/CMakeFiles/obj2yaml.dir/elf2yaml.cpp.o
[8810/8839] Linking CXX executable bin/obj2yaml
[8811/8839] Building CXX object tools/clang/lib/ASTMatchers/Dynamic/CMakeFiles/obj.clangDynamicASTMatchers.dir/Registry.cpp.o
[8812/8839] Linking CXX static library lib/libclangDynamicASTMatchers.a
[8813/8839] Linking CXX shared library lib/libclang-cpp.so.24.0git
[8814/8839] Creating library symlink lib/libclang-cpp.so

command timed out: 1200 seconds without output running [b'python', b'../sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/buildbot_selector.py'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=2346.854414

```

</details>

https://github.com/llvm/llvm-project/pull/219401