[clang] [Clang] Always pass detected CUDA path to 'clang-nvlink-wrapper' (PR #152789)

[Matt Arsenault via cfe-commits]

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@@ -691,9 +696,12 @@ Error runNVLink(ArrayRef<StringRef> Files, const ArgList &Args) {
   if (Args.hasArg(OPT_lto_emit_asm) || Args.hasArg(OPT_lto_emit_llvm))
     return Error::success();
 
-  std::string CudaPath = Args.getLastArgValue(OPT_cuda_path_EQ).str();
-  Expected<std::string> NVLinkPath =
-      findProgram(Args, "nvlink", {CudaPath + "/bin"});
+  SmallVector<StringRef, 1> SearchPaths;
+  if (Arg *A = Args.getLastArg(OPT_cuda_path_EQ))
+    SearchPaths.push_back(
+        Args.MakeArgString(StringRef(A->getValue()) + "/bin"));
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arsenm wrote:

Either don't need StringRef() or it makes sense as Twine() 

https://github.com/llvm/llvm-project/pull/152789