[llvm] [llvm-(min-)tblgen] Avoid redundant source compilation (PR #114494)

[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/8194

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
7.599 [6573/9/736] Copying clang's vadefs.h...
7.602 [6573/8/737] Copying clang's yvals_core.h...
7.603 [6573/7/738] Copying clang's mm_malloc.h...
7.607 [6573/6/739] Copying clang's cuda_wrappers/bits/shared_ptr_base.h...
7.607 [6573/5/740] Copying clang's cuda_wrappers/complex...
7.608 [6573/4/741] Copying clang's cuda_wrappers/new...
7.608 [6573/3/742] Copying clang's cuda_wrappers/algorithm...
7.619 [6573/2/743] Copying clang's cuda_wrappers/cmath...
7.766 [6573/1/744] Building CXX object utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/IntrinsicEmitter.cpp.o
7.893 [6572/1/745] Linking CXX executable bin/llvm-min-tblgen
FAILED: bin/llvm-min-tblgen 
: && /usr/local/bin/c++ -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -fno-lifetime-dse -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-maybe-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -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 utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/ARMTargetDefEmitter.cpp.o utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/Attributes.cpp.o utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/CodeGenIntrinsics.cpp.o utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/DirectiveEmitter.cpp.o utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/IntrinsicEmitter.cpp.o utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/RISCVTargetDefEmitter.cpp.o utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/SDNodeProperties.cpp.o utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/TableGen.cpp.o utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/VTEmitter.cpp.o utils/TableGen/CMakeFiles/llvm-min-tblgen.dir/llvm-min-tblgen.cpp.o -o bin/llvm-min-tblgen  -Wl,-rpath,"\$ORIGIN/../lib:/home/tcwg-buildbot/worker/flang-aarch64-latest-gcc/build/lib"  lib/libLLVMTableGen.so.20.0git  -Wl,-rpath-link,/home/tcwg-buildbot/worker/flang-aarch64-latest-gcc/build/lib && :
/usr/bin/ld: utils/TableGen/Basic/CMakeFiles/obj.LLVMTableGenBasic.dir/ARMTargetDefEmitter.cpp.o: undefined reference to symbol '_ZN4llvm23EnableABIBreakingChecksE'
/usr/bin/ld: /home/tcwg-buildbot/worker/flang-aarch64-latest-gcc/build/./lib/libLLVMSupport.so.20.0git: 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/114494