[clang] [clang][modules] Print library module manifest path. (PR #76451)

[Chuanqi Xu via cfe-commits]

================
@@ -2164,6 +2164,12 @@ bool Driver::HandleImmediateArgs(const Compilation &C) {
     return false;
   }
 
+  if (C.getArgs().hasArg(options::OPT_print_library_module_manifest_path)) {
+    llvm::outs() << "module: ="
----------------
ChuanqiXu9 wrote:

But "module: =" doesn't look like an error value too. And I feel it just adds the work the tool vendors need to do. @mathstuf @boris-kolpackov do you have an opinion here?

https://github.com/llvm/llvm-project/pull/76451