[OpenMP] Fixes save-temps multi-arch compilation with opaque-offload-linker

Fixes multi-arch save-temps compilation in opaque-offload-linker.
Issue caused by files getting overwritten during unpacking.
Adds TargetID to temp file name.

Change-Id: Iebd34f9f6cf9375c08b3f775397b62b372fa8800

Author: nicebert

clang/lib/Driver/ToolChains/Clang.cpp

@@ -9416,7 +9416,7 @@ void LinkerWrapper::ConstructOpaqueJob(Compilation &C, const JobAction &JA,
       if (II.isFilename()) {
         OutputFile = llvm::sys::path::stem(II.getFilename()).str();
         OutputFilePrefix = llvm::sys::path::stem(II.getBaseInput()).str() +
-                           "-openmp-" + TheTriple.str();
+                           "-openmp-" + TheTriple.str() + "-" + TargetID.str();
 
         // generate command to unpackage each II.getFilename()
         auto UnpackagedFileName =