[clang] [LinkerWrapper] Pass all files to the device linker (PR #97573)

[Artem Belevich via cfe-commits]

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@@ -504,18 +511,23 @@ Expected<StringRef> clang(ArrayRef<StringRef> InputFiles, const ArgList &Args) {
     llvm::copy(LinkerArgs, std::back_inserter(CmdArgs));
   }
 
-  // Pass on -mllvm options to the clang invocation.
-  for (const opt::Arg *Arg : Args.filtered(OPT_mllvm)) {
-    CmdArgs.push_back("-mllvm");
-    CmdArgs.push_back(Arg->getValue());
-  }
+  // Pass on -mllvm options to the linker invocation.
+  for (const opt::Arg *Arg : Args.filtered(OPT_mllvm))
+    CmdArgs.push_back(
+        Args.MakeArgString("-Wl,-mllvm=" + StringRef(Arg->getValue())));
 
   if (Args.hasArg(OPT_debug))
     CmdArgs.push_back("-g");
 
   if (SaveTemps)
     CmdArgs.push_back("-save-temps");
 
+  if (SaveTemps && linkerSupportsLTO(Args))
----------------
Artem-B wrote:

Is `-save-temps` propagated from the top-level compilation? 
If so, how do we handle `--save-temps=obj -o /some/other/dir/foo.o` ?

https://github.com/llvm/llvm-project/pull/97573