[clang] [OpenMP] Implicitly include the 'cgpu' and 'mgpu' libraries for OpenMP (PR #67557)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->

:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff cd7f1714dea16261e0362b80958296f9782d625e b87a2fd522c874a222aa497e0db1f5de5d35ff51 -- clang/lib/Driver/ToolChains/CommonArgs.cpp clang/test/Driver/openmp-offload-gpu.c
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp b/clang/lib/Driver/ToolChains/CommonArgs.cpp
index 4c240e519f92..483ecd0ae592 100644
--- a/clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -881,7 +881,8 @@ static void addOpenMPDeviceLibC(const ToolChain &TC, const ArgList &Args,
   SmallString<256> LibCDecls(TC.getDriver().ResourceDir);
   llvm::sys::path::append(LibCDecls, "include", "llvm_libc_wrappers",
                           "llvm-libc-decls");
-  bool HasLibC = llvm::sys::fs::exists(LibCDecls) && llvm::sys::fs::is_directory(LibCDecls);
+  bool HasLibC = llvm::sys::fs::exists(LibCDecls) &&
+                 llvm::sys::fs::is_directory(LibCDecls);
   if (Args.hasFlag(options::OPT_gpulibc, options::OPT_nogpulibc, HasLibC)) {
     CmdArgs.push_back("-lcgpu");
     CmdArgs.push_back("-lmgpu");

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https://github.com/llvm/llvm-project/pull/67557