[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 `lldb-aarch64-windows` running on `linaro-armv8-windows-msvc-05` while building `libc,llvm` at step 4 "build".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/141/builds/7203

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

```
Step 4 (build) failure: build (failure)
...
557.404 [155/10/6496] Generating ../../bin/llvm-ranlib.exe
557.507 [154/10/6497] Generating ../../bin/llvm-lib.exe
557.523 [153/10/6498] Linking CXX executable bin\llvm-config.exe
557.544 [152/10/6499] Linking CXX static library lib\clangDynamicASTMatchers.lib
557.556 [151/10/6500] Generating ../../bin/llvm-dlltool.exe
557.638 [150/10/6501] Linking CXX static library lib\clangAnalysisFlowSensitiveModels.lib
557.719 [149/10/6502] Linking CXX static library lib\clangTransformer.lib
557.745 [148/10/6503] Linking CXX static library lib\clangDirectoryWatcher.lib
557.757 [147/10/6504] Linking CXX static library lib\clangToolingInclusionsStdlib.lib
557.799 [146/10/6505] 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_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\lldb-aarch64-windows\build\tools\llvm-gpu-loader -IC:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\llvm\tools\llvm-gpu-loader -IC:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\include -IC:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\llvm\include -IC:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\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 /DNDEBUG -std:c++17 -MD  /EHs-c- /GR- /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\lldb-aarch64-windows\llvm-project\llvm\tools\llvm-gpu-loader\llvm-gpu-loader.cpp
C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\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.
557.799 [146/9/6506] Linking CXX executable bin\llvm-profdata.exe
557.831 [146/8/6507] Linking CXX static library lib\clangIndexSerialization.lib
557.838 [146/7/6508] Linking CXX executable bin\llvm-ctxprof-util.exe
558.189 [146/6/6509] Linking CXX executable bin\apinotes-test.exe
558.555 [146/5/6510] Linking CXX executable bin\diagtool.exe
559.081 [146/4/6511] Linking CXX executable bin\llvm-lto.exe
559.128 [146/3/6512] Linking CXX shared library bin\LTO.dll
561.444 [146/2/6513] Linking CXX executable bin\lld.exe
561.837 [146/1/6514] Linking CXX executable bin\clang.exe
ninja: build stopped: subcommand failed.

```

</details>

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