[llvm] [IR2Vec] Initial infrastructure for MIR2Vec (PR #161463)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-aarch64-darwin` running on `doug-worker-5` while building `llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/190/builds/28638

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
253.430 [758/10/5516] Building CXX object tools/lli/CMakeFiles/lli.dir/lli.cpp.o
253.964 [757/10/5517] Building CXX object unittests/Analysis/CMakeFiles/AnalysisTests.dir/ReplaceWithVecLibTest.cpp.o
254.438 [756/10/5518] Building CXX object unittests/Analysis/CMakeFiles/AnalysisTests.dir/IR2VecTest.cpp.o
255.070 [755/10/5519] Building CXX object unittests/CodeGen/CMakeFiles/CodeGenTests.dir/CCStateTest.cpp.o
255.100 [754/10/5520] Building CXX object unittests/CodeGen/CMakeFiles/CodeGenTests.dir/PassManagerTest.cpp.o
255.128 [753/10/5521] Building CXX object unittests/CodeGen/CMakeFiles/CodeGenTests.dir/ScalableVectorMVTsTest.cpp.o
256.145 [752/10/5522] Building CXX object unittests/Analysis/CMakeFiles/AnalysisTests.dir/FunctionPropertiesAnalysisTest.cpp.o
256.745 [751/10/5523] Building CXX object unittests/CodeGen/CMakeFiles/CodeGenTests.dir/LexicalScopesTest.cpp.o
257.176 [750/10/5524] Building CXX object unittests/CodeGen/CMakeFiles/CodeGenTests.dir/MachineBasicBlockTest.cpp.o
257.848 [749/10/5525] Building CXX object unittests/CodeGen/CMakeFiles/CodeGenTests.dir/MIR2VecTest.cpp.o
FAILED: [code=1] unittests/CodeGen/CMakeFiles/CodeGenTests.dir/MIR2VecTest.cpp.o 
CCACHE_CPP2=yes CCACHE_HASHDIR=yes CCACHE_SLOPPINESS=pch_defines,time_macros /opt/homebrew/bin/ccache /usr/bin/clang++ -DGTEST_HAS_RTTI=0 -DLLVM_BUILD_STATIC -D_DEBUG -D_GLIBCXX_ASSERTIONS -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/Users/buildbot/buildbot-root/aarch64-darwin/build/unittests/CodeGen -I/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/unittests/CodeGen -I/Users/buildbot/buildbot-root/aarch64-darwin/build/include -I/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/include -I/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/third-party/unittest/googletest/include -I/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/third-party/unittest/googlemock/include -isystem /opt/homebrew/include -fPIC -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 -O3 -DNDEBUG -std=c++17 -arch arm64 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX14.4.sdk  -Wno-variadic-macros -Wno-gnu-zero-variadic-macro-arguments -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -Wno-suggest-override -MD -MT unittests/CodeGen/CMakeFiles/CodeGenTests.dir/MIR2VecTest.cpp.o -MF unittests/CodeGen/CMakeFiles/CodeGenTests.dir/MIR2VecTest.cpp.o.d -o unittests/CodeGen/CMakeFiles/CodeGenTests.dir/MIR2VecTest.cpp.o -c /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/unittests/CodeGen/MIR2VecTest.cpp
/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/unittests/CodeGen/MIR2VecTest.cpp:58:5: error: use of undeclared identifier 'LLVMInitializeX86TargetInfo'; did you mean 'LLVMInitializeAArch64TargetInfo'?
    LLVMInitializeX86TargetInfo();
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~
    LLVMInitializeAArch64TargetInfo
/Users/buildbot/buildbot-root/aarch64-darwin/build/include/llvm/Config/Targets.def:26:1: note: 'LLVMInitializeAArch64TargetInfo' declared here
LLVM_TARGET(AArch64)
^
/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/include/llvm/Support/TargetSelect.h:24:17: note: expanded from macro 'LLVM_TARGET'
  LLVM_ABI void LLVMInitialize##TargetName##TargetInfo();
                ^
<scratch space>:134:1: note: expanded from here
LLVMInitializeAArch64TargetInfo
^
/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/unittests/CodeGen/MIR2VecTest.cpp:59:5: error: use of undeclared identifier 'LLVMInitializeX86Target'; did you mean 'LLVMInitializeAArch64Target'?
    LLVMInitializeX86Target();
    ^~~~~~~~~~~~~~~~~~~~~~~
    LLVMInitializeAArch64Target
/Users/buildbot/buildbot-root/aarch64-darwin/build/include/llvm/Config/Targets.def:26:1: note: 'LLVMInitializeAArch64Target' declared here
LLVM_TARGET(AArch64)
^
/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/include/llvm/Support/TargetSelect.h:28:17: note: expanded from macro 'LLVM_TARGET'
  LLVM_ABI void LLVMInitialize##TargetName##Target();
                ^
<scratch space>:136:1: note: expanded from here
LLVMInitializeAArch64Target
^
/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/unittests/CodeGen/MIR2VecTest.cpp:60:5: error: use of undeclared identifier 'LLVMInitializeX86TargetMC'; did you mean 'LLVMInitializeAArch64TargetMC'?
    LLVMInitializeX86TargetMC();
    ^~~~~~~~~~~~~~~~~~~~~~~~~
    LLVMInitializeAArch64TargetMC
/Users/buildbot/buildbot-root/aarch64-darwin/build/include/llvm/Config/Targets.def:26:1: note: 'LLVMInitializeAArch64TargetMC' declared here
LLVM_TARGET(AArch64)
^
/Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/include/llvm/Support/TargetSelect.h:33:17: note: expanded from macro 'LLVM_TARGET'
  LLVM_ABI void LLVMInitialize##TargetName##TargetMC();
                ^
<scratch space>:138:1: note: expanded from here

```

</details>

https://github.com/llvm/llvm-project/pull/161463