[clang] [llvm] Revert "[Hexagon] NFC: Reduce the amount of version-specific code" (PR #146193)

[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 `clang,llvm` at step 12 "ninja check 2".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/41/builds/7583

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

```
Step 12 (ninja check 2) failure: stage 2 checked (failure)
...
[1291/1396] Linking CXX executable unittests/Target/AMDGPU/AMDGPUTests
clang++: warning: argument unused during compilation: '-mllvm -scalable-vectorization=preferred' [-Wunused-command-line-argument]
clang++: warning: argument unused during compilation: '-mllvm -treat-scalable-fixed-error-as-warning=false' [-Wunused-command-line-argument]
[1305/1396] Linking CXX executable unittests/Testing/Annotations/TestingAnnotationTests
clang++: warning: argument unused during compilation: '-mllvm -scalable-vectorization=preferred' [-Wunused-command-line-argument]
clang++: warning: argument unused during compilation: '-mllvm -treat-scalable-fixed-error-as-warning=false' [-Wunused-command-line-argument]
[1308/1396] Linking CXX executable unittests/TextAPI/TextAPITests
clang++: warning: argument unused during compilation: '-mllvm -scalable-vectorization=preferred' [-Wunused-command-line-argument]
clang++: warning: argument unused during compilation: '-mllvm -treat-scalable-fixed-error-as-warning=false' [-Wunused-command-line-argument]
[1312/1396] Linking CXX executable unittests/Transforms/Coroutines/CoroTests
FAILED: unittests/Transforms/Coroutines/CoroTests 
: && /home/tcwg-buildbot/worker/clang-aarch64-sve-vla-2stage/stage1.install/bin/clang++ -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 -O3 -DNDEBUG -fuse-ld=lld -Wl,--color-diagnostics    -Wl,--gc-sections unittests/Transforms/Coroutines/CMakeFiles/CoroTests.dir/ExtraRematTest.cpp.o -o unittests/Transforms/Coroutines/CoroTests  lib/libLLVMAnalysis.a  lib/libLLVMAsmParser.a  lib/libLLVMCore.a  lib/libLLVMCoroutines.a  lib/libLLVMPasses.a  lib/libLLVMSupport.a  lib/libLLVMTargetParser.a  lib/libLLVMTransformUtils.a  lib/libLLVMSupport.a  lib/libllvm_gtest_main.a  lib/libllvm_gtest.a  lib/libLLVMTestingSupport.a  lib/libLLVMCoroutines.a  lib/libLLVMipo.a  lib/libLLVMFrontendOpenMP.a  lib/libLLVMFrontendOffloading.a  lib/libLLVMObjectYAML.a  lib/libLLVMFrontendAtomic.a  lib/libLLVMFrontendDirective.a  lib/libLLVMLinker.a  lib/libLLVMCFGuard.a  lib/libLLVMGlobalISel.a  lib/libLLVMSelectionDAG.a  lib/libLLVMCodeGen.a  lib/libLLVMScalarOpts.a  lib/libLLVMAggressiveInstCombine.a  lib/libLLVMCGData.a  lib/libLLVMBitWriter.a  lib/libLLVMCodeGenTypes.a  lib/libLLVMHipStdPar.a  lib/libLLVMInstCombine.a  lib/libLLVMIRPrinter.a  lib/libLLVMObjCARCOpts.a  lib/libLLVMTarget.a  lib/libLLVMVectorize.a  lib/libLLVMSandboxIR.a  lib/libLLVMInstrumentation.a  lib/libLLVMTransformUtils.a  lib/libLLVMAnalysis.a  lib/libLLVMProfileData.a  lib/libLLVMSymbolize.a  lib/libLLVMDebugInfoGSYM.a  lib/libLLVMDebugInfoPDB.a  lib/libLLVMDebugInfoCodeView.a  lib/libLLVMDebugInfoMSF.a  lib/libLLVMDebugInfoBTF.a  lib/libLLVMDebugInfoDWARF.a  lib/libLLVMObject.a  lib/libLLVMIRReader.a  lib/libLLVMAsmParser.a  lib/libLLVMBitReader.a  lib/libLLVMCore.a  lib/libLLVMRemarks.a  lib/libLLVMBitstreamReader.a  lib/libLLVMMCParser.a  lib/libLLVMTextAPI.a  lib/libLLVMDebugInfoDWARFLowLevel.a  lib/libLLVMMC.a  lib/libLLVMBinaryFormat.a  lib/libLLVMTargetParser.a  lib/libllvm_gtest.a  lib/libLLVMSupport.a  lib/libLLVMDemangle.a  -lrt  -ldl  -lm  /usr/lib/aarch64-linux-gnu/libz.so  -lpthread && :
clang++: warning: argument unused during compilation: '-mllvm -scalable-vectorization=preferred' [-Wunused-command-line-argument]
clang++: warning: argument unused during compilation: '-mllvm -treat-scalable-fixed-error-as-warning=false' [-Wunused-command-line-argument]
ld.lld: error: cannot open lib/libllvm_gtest.a: No such file or directory
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
[1330/1396] Building CXX object unittests/Transforms/Utils/CMakeFiles/UtilsTests.dir/CloningTest.cpp.o
[1332/1396] Building CXX object unittests/Transforms/Vectorize/SandboxVectorizer/CMakeFiles/SandboxVectorizerTests.dir/DependencyGraphTest.cpp.o
[1333/1396] Building CXX object unittests/Transforms/Vectorize/CMakeFiles/VectorizeTests.dir/VPlanTest.cpp.o
[1334/1396] Building CXX object unittests/Transforms/Scalar/CMakeFiles/ScalarTests.dir/LoopPassManagerTest.cpp.o
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/146193