[clang] [LinkerWrapper] Use the correct empty file on Windows (PR #84322)

[Michael Kruse via cfe-commits]

================
@@ -410,7 +410,10 @@ fatbinary(ArrayRef<std::pair<StringRef, StringRef>> 
InputFiles,
     Targets.push_back(Saver.save("hipv4-amdgcn-amd-amdhsa--" + Arch));
   CmdArgs.push_back(Saver.save(llvm::join(Targets, ",")));
 
-  CmdArgs.push_back("-input=/dev/null");
+  if (Triple.isOSWindows())
----------------
Meinersbur wrote:

This does not depend on the target platform, but the host OS that runs 
clang-linker-wrapper (`#ifdef _WIN32`)

https://github.com/llvm/llvm-project/pull/84322
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