[libc] [llvm] [LLVM] Make the GPU loader utilities an LLVM tool (PR #132096)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `polly-x86_64-linux-shared-plugin` running on `polly-x86_64-gce2` while building `libc,llvm` at step 5 "build".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/118/builds/5317

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

```
Step 5 (build) failure: 'ninja' (failure)
...
   55 |   [[maybe_unused]] WriteMode write_mode_;
      |                              ^~~~~~~~~~~
/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/llvm/tools/llvm-gpu-loader/llvm-gpu-loader.cpp: In function ‘int main(int, const char**, const char**)’:
/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.src/llvm/tools/llvm-gpu-loader/llvm-gpu-loader.cpp:132:20: warning: unused variable ‘params’ [-Wunused-variable]
  132 |   LaunchParameters params{threads_x, threads_y, threads_z,
      |                    ^~~~~~
[3853/4334] Linking CXX static library lib/libLLVMExegesisX86_static.a
[3854/4334] Building CXX object tools/llvm-gsymutil/CMakeFiles/llvm-gsymutil.dir/llvm-gsymutil.cpp.o
[3855/4334] Building CXX object tools/llvm-gsymutil/CMakeFiles/llvm-gsymutil.dir/llvm-gsymutil-driver.cpp.o
[3856/4334] Linking CXX executable bin/llvm-gpu-loader
FAILED: bin/llvm-gpu-loader 
: && /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-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 -fuse-ld=lld -Wl,--color-diagnostics     -Wl,--gc-sections tools/llvm-gpu-loader/CMakeFiles/llvm-gpu-loader.dir/llvm-gpu-loader.cpp.o -o bin/llvm-gpu-loader  -Wl,-rpath,"\$ORIGIN/../lib:/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.obj/lib:"  lib/libLLVMOption.so.21.0git  lib/libLLVMFrontendOffloading.so.21.0git  lib/libLLVMObject.so.21.0git  lib/libLLVMBinaryFormat.so.21.0git  lib/libLLVMSupport.so.21.0git  -Wl,-rpath-link,/home/worker/buildbot-workers/polly-x86_64-gce2/rundir/llvm.obj/lib && :
ld.lld: error: undefined symbol: llvm::Triple::getArchTypeName(llvm::Triple::ArchType)
>>> referenced by llvm-gpu-loader.cpp
>>>               tools/llvm-gpu-loader/CMakeFiles/llvm-gpu-loader.dir/llvm-gpu-loader.cpp.o:(main)
collect2: error: ld returned 1 exit status
[3857/4334] Linking CXX shared library lib/libLLVMExegesisX86.so.21.0git
[3858/4334] Linking CXX executable bin/llvm-gsymutil
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/132096