[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 `clang-arm64-windows-msvc` running on `linaro-armv8-windows-msvc-04` while building `libc,llvm` at step 4 "build stage 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/161/builds/5088

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

```
Step 4 (build stage 1) failure: 'ninja' (failure)
...
[8996/9326] Building CXX object tools\llvm-reduce\CMakeFiles\llvm-reduce.dir\deltas\ReduceArguments.cpp.obj
[8997/9326] Building CXX object tools\llvm-reduce\CMakeFiles\llvm-reduce.dir\deltas\ReduceAttributes.cpp.obj
[8998/9326] Building CXX object tools\llvm-reduce\CMakeFiles\llvm-reduce.dir\deltas\ReduceBasicBlocks.cpp.obj
[8999/9326] Building CXX object tools\llvm-reduce\CMakeFiles\llvm-reduce.dir\deltas\ReduceDIMetadata.cpp.obj
[9000/9326] Building CXX object tools\llvm-reduce\CMakeFiles\llvm-reduce.dir\deltas\ReduceDistinctMetadata.cpp.obj
[9001/9326] Building CXX object tools\llvm-reduce\CMakeFiles\llvm-reduce.dir\deltas\ReduceDbgRecords.cpp.obj
[9002/9326] Building CXX object tools\llvm-reduce\CMakeFiles\llvm-reduce.dir\deltas\ReduceFunctionBodies.cpp.obj
[9003/9326] Building CXX object tools\llvm-reduce\CMakeFiles\llvm-reduce.dir\deltas\ReduceFunctions.cpp.obj
[9004/9326] Building CXX object tools\llvm-reduce\CMakeFiles\llvm-reduce.dir\deltas\ReduceGlobalObjects.cpp.obj
[9005/9326] Building CXX object tools\llvm-gpu-loader\CMakeFiles\llvm-gpu-loader.dir\llvm-gpu-loader.cpp.obj
FAILED: tools/llvm-gpu-loader/CMakeFiles/llvm-gpu-loader.dir/llvm-gpu-loader.cpp.obj 
ccache C:\Users\tcwg\scoop\apps\llvm\current\bin\clang-cl.exe  /nologo -TP -DGTEST_HAS_RTTI=0 -DLIBC_NAMESPACE=__llvm_libc_common_utils -DLLVM_BUILD_STATIC -DUNICODE -D_CRT_NONSTDC_NO_DEPRECATE -D_CRT_NONSTDC_NO_WARNINGS -D_CRT_SECURE_NO_DEPRECATE -D_CRT_SECURE_NO_WARNINGS -D_GLIBCXX_ASSERTIONS -D_HAS_EXCEPTIONS=0 -D_SCL_SECURE_NO_DEPRECATE -D_SCL_SECURE_NO_WARNINGS -D_UNICODE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -IC:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\stage1\tools\llvm-gpu-loader -IC:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm\llvm\tools\llvm-gpu-loader -IC:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\stage1\include -IC:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm\llvm\include -IC:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm\cmake\Modules\..\..\libc /DWIN32 /D_WINDOWS   /Zc:inline /Zc:__cplusplus /Oi /Brepro /bigobj /permissive- -Werror=unguarded-availability-new /W4  -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported /Gw /O2 /Ob2  -std:c++17 -MD  /EHs-c- /GR- -UNDEBUG /showIncludes /Fotools\llvm-gpu-loader\CMakeFiles\llvm-gpu-loader.dir\llvm-gpu-loader.cpp.obj /Fdtools\llvm-gpu-loader\CMakeFiles\llvm-gpu-loader.dir\ -c -- C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm\llvm\tools\llvm-gpu-loader\llvm-gpu-loader.cpp
C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm\llvm\tools\llvm-gpu-loader\llvm-gpu-loader.cpp(34,10): fatal error: 'sys/file.h' file not found
   34 | #include <sys/file.h>
      |          ^~~~~~~~~~~~
1 error generated.
[9006/9326] Building CXX object tools\llvm-reduce\CMakeFiles\llvm-reduce.dir\deltas\ReduceGlobalValues.cpp.obj
[9007/9326] Building CXX object tools\llvm-reduce\CMakeFiles\llvm-reduce.dir\deltas\ReduceGlobalVarInitializers.cpp.obj
[9008/9326] Building CXX object tools\llvm-reduce\CMakeFiles\llvm-reduce.dir\deltas\ReduceGlobalVars.cpp.obj
[9009/9326] Building CXX object tools\llvm-reduce\CMakeFiles\llvm-reduce.dir\deltas\ReduceInstructions.cpp.obj
[9010/9326] Building CXX object tools\clang\tools\extra\clangd\index\dex\dexp\CMakeFiles\dexp.dir\Dexp.cpp.obj
[9011/9326] Building CXX object tools\clang\tools\extra\clangd\indexer\CMakeFiles\clangd-indexer.dir\IndexerMain.cpp.obj
[9012/9326] Building CXX object tools\clang\tools\extra\clangd\refactor\tweaks\CMakeFiles\obj.clangDaemonTweaks.dir\RemoveUsingNamespace.cpp.obj
[9013/9326] Building CXX object tools\clang\tools\extra\clangd\refactor\tweaks\CMakeFiles\obj.clangDaemonTweaks.dir\ExtractFunction.cpp.obj
[9014/9326] Building CXX object tools\llvm-reduce\CMakeFiles\llvm-reduce.dir\ReducerWorkItem.cpp.obj
ninja: build stopped: subcommand failed.

```

</details>

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