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

Full details are available at: https://lab.llvm.org/buildbot/#/builders/89/builds/13541

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
7.117 [6625/9/668] Copying clang's hresetintrin.h...
7.118 [6625/8/669] Copying clang's ia32intrin.h...
7.118 [6625/7/670] Copying clang's immintrin.h...
7.118 [6625/6/671] Copying clang's invpcidintrin.h...
7.118 [6625/5/672] Copying clang's keylockerintrin.h...
7.119 [6625/4/673] Copying clang's lwpintrin.h...
7.119 [6625/3/674] Copying clang's lzcntintrin.h...
7.119 [6625/2/675] Copying clang's mm3dnow.h...
7.119 [6625/1/676] Copying clang's mmintrin.h...
7.172 [6624/1/677] Linking CXX executable bin/llvm-min-tblgen
FAILED: bin/llvm-min-tblgen 
: && /usr/local/bin/c++ -stdlib=libc++ -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 -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -stdlib=libc++     -Wl,-rpath-link,/home/tcwg-buildbot/worker/flang-aarch64-libcxx/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-libcxx/build/lib"  lib/libLLVMTableGen.so.20.0git  -Wl,-rpath-link,/home/tcwg-buildbot/worker/flang-aarch64-libcxx/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-libcxx/build/./lib/libLLVMSupport.so.20.0git: error adding symbols: DSO missing from command line
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/114494