[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 `flang-aarch64-latest-gcc` running on `linaro-flang-aarch64-latest-gcc` while building `llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/130/builds/15809

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
4415.344 [367/1/7398] Building CXX object tools/llvm-gsymutil/CMakeFiles/llvm-gsymutil.dir/llvm-gsymutil-driver.cpp.o
4415.716 [365/2/7399] Building Opts.inc...
4415.926 [365/1/7400] Linking CXX executable bin/llvm-gsymutil
4416.312 [364/1/7401] Building CXX object tools/llvm-ifs/CMakeFiles/llvm-ifs.dir/ErrorCollector.cpp.o
4416.872 [363/1/7402] Building CXX object tools/llvm-ifs/CMakeFiles/llvm-ifs.dir/llvm-ifs.cpp.o
4417.242 [362/1/7403] Building CXX object tools/llvm-ifs/CMakeFiles/llvm-ifs.dir/llvm-ifs-driver.cpp.o
4417.652 [361/1/7404] Linking CXX executable bin/llvm-ifs
4417.941 [359/2/7405] Building CXX object tools/llvm-isel-fuzzer/CMakeFiles/llvm-isel-fuzzer.dir/DummyISelFuzzer.cpp.o
4435.491 [359/1/7406] Building CXX object tools/llvm-ir2vec/CMakeFiles/llvm-ir2vec.dir/llvm-ir2vec.cpp.o
4435.798 [358/1/7407] Linking CXX executable bin/llvm-ir2vec
FAILED: bin/llvm-ir2vec 
: && /usr/local/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 -Wl,-rpath-link,/home/tcwg-buildbot/worker/flang-aarch64-latest-gcc/build/./lib  -Wl,--gc-sections tools/llvm-ir2vec/CMakeFiles/llvm-ir2vec.dir/llvm-ir2vec.cpp.o -o bin/llvm-ir2vec  -Wl,-rpath,"\$ORIGIN/../lib:/home/tcwg-buildbot/worker/flang-aarch64-latest-gcc/build/lib:"  lib/libLLVMMIRParser.so.22.0git  lib/libLLVMAArch64AsmParser.so.22.0git  lib/libLLVMAArch64CodeGen.so.22.0git  lib/libLLVMAArch64Desc.so.22.0git  lib/libLLVMAArch64Info.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/tcwg-buildbot/worker/flang-aarch64-latest-gcc/build/lib && :
/usr/bin/ld: tools/llvm-ir2vec/CMakeFiles/llvm-ir2vec.dir/llvm-ir2vec.cpp.o: undefined reference to symbol '_ZN4llvm6TripleC1EONSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE'
/usr/bin/ld: /home/tcwg-buildbot/worker/flang-aarch64-latest-gcc/build/./lib/libLLVMTargetParser.so.22.0git: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

```

</details>

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