[llvm] [MIR2Vec][llvm-ir2vec] Add MIR2Vec support to llvm-ir2vec tool (PR #164025)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-nvptx-nvidia-ubuntu` running on `as-builder-7` while building `llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/180/builds/27196

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
60.711 [5/5/2834] Linking CXX executable bin/bugpoint
60.725 [4/5/2835] Linking CXX executable bin/llvm-reduce
60.726 [4/4/2836] Linking CXX shared library lib/libLLVMOptDriver.so.22.0git
60.732 [3/4/2837] Building CXX object tools/bugpoint-passes/CMakeFiles/BugpointPasses.dir/TestPasses.cpp.o
60.750 [2/4/2838] Creating library symlink lib/libLLVMOptDriver.so
60.801 [1/4/2839] Linking CXX shared module lib/BugpointPasses.so
60.802 [1/3/2840] Linking CXX executable bin/llvm-exegesis
60.886 [1/2/2841] Linking CXX executable bin/opt
68.334 [1/1/2842] Building CXX object tools/llvm-ir2vec/CMakeFiles/llvm-ir2vec.dir/llvm-ir2vec.cpp.o
68.454 [0/1/2843] Linking CXX executable bin/llvm-ir2vec
FAILED: bin/llvm-ir2vec 
: && /usr/bin/c++ -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-dangling-reference -Wno-redundant-move -Wno-pessimizing-move -Wno-array-bounds -Wno-stringop-overread -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -fuse-ld=gold     -Wl,--gc-sections tools/llvm-ir2vec/CMakeFiles/llvm-ir2vec.dir/llvm-ir2vec.cpp.o -o bin/llvm-ir2vec  -Wl,-rpath,"\$ORIGIN/../lib:/home/buildbot/worker/as-builder-7/llvm-nvptx-nvidia-ubuntu/build/lib:"  lib/libLLVMMIRParser.so.22.0git  lib/libLLVMX86AsmParser.so.22.0git  lib/libLLVMX86CodeGen.so.22.0git  lib/libLLVMNVPTXCodeGen.so.22.0git  lib/libLLVMX86Desc.so.22.0git  lib/libLLVMNVPTXDesc.so.22.0git  lib/libLLVMX86Info.so.22.0git  lib/libLLVMNVPTXInfo.so.22.0git  lib/libLLVMCodeGen.so.22.0git  lib/libLLVMAnalysis.so.22.0git  lib/libLLVMIRReader.so.22.0git  lib/libLLVMCore.so.22.0git  lib/libLLVMSupport.so.22.0git  -Wl,-rpath-link,/home/buildbot/worker/as-builder-7/llvm-nvptx-nvidia-ubuntu/build/lib && :
tools/llvm-ir2vec/CMakeFiles/llvm-ir2vec.dir/llvm-ir2vec.cpp.o:llvm-ir2vec.cpp:function main::{lambda(llvm::StringRef, llvm::StringRef)#1}::operator()(llvm::StringRef, llvm::StringRef) const [clone .isra.0]:(.text._ZZ4mainENKUlN4llvm9StringRefES0_E_clES0_S0_.isra.0+0x8c): error: undefined reference to 'llvm::Triple::Triple(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&&)'
tools/llvm-ir2vec/CMakeFiles/llvm-ir2vec.dir/llvm-ir2vec.cpp.o:llvm-ir2vec.cpp:function main::{lambda(llvm::StringRef, llvm::StringRef)#1}::operator()(llvm::StringRef, llvm::StringRef) const [clone .isra.0]:(.text._ZZ4mainENKUlN4llvm9StringRefES0_E_clES0_S0_.isra.0+0x30c): error: undefined reference to 'llvm::sys::getDefaultTargetTriple[abi:cxx11]()'
tools/llvm-ir2vec/CMakeFiles/llvm-ir2vec.dir/llvm-ir2vec.cpp.o:llvm-ir2vec.cpp:function main::{lambda(llvm::StringRef, llvm::StringRef)#1}::operator()(llvm::StringRef, llvm::StringRef) const [clone .isra.0]:(.text._ZZ4mainENKUlN4llvm9StringRefES0_E_clES0_S0_.isra.0+0x328): error: undefined reference to 'llvm::Triple::setTriple(llvm::Twine const&)'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/164025