[clang] [Driver][Darwin] Pass stack usage file for LTO (PR #178005)

[Marina Taylor via cfe-commits]

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@@ -660,6 +660,15 @@ void darwin::Linker::ConstructJob(Compilation &C, const JobAction &JA,
     CmdArgs.push_back(Args.MakeArgString("-lto-stats-file=" + StatsFile.str()));
   }
 
+  // Set up stack usage file path.
+  if (Args.hasArg(options::OPT_fstack_usage)) {
+    SmallString<128> StackUsageFile(Output.getFilename());
+    llvm::sys::path::replace_extension(StackUsageFile, "su");
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citymarina wrote:

It's what the existing code does in the non-LTO case: https://github.com/llvm/llvm-project/blob/92c26bb1a57b5f8682b0fb21b8acfc32951cb67e/clang/lib/Driver/ToolChains/Clang.cpp#L6515-L6525

https://github.com/llvm/llvm-project/pull/178005