Merge pull request #28610 from nate-chandler/generic-metadata-prespecialization

Generic metadata prespecialization, part 1

lib/Frontend/CompilerInvocation.cpp

@@ -1245,6 +1245,10 @@ static bool ParseIRGenArgs(IRGenOptions &Opts, ArgList &Args,
     Opts.DisableLegacyTypeInfo = true;
   }
 
+  if (Args.hasArg(OPT_prespecialize_generic_metadata)) {
+    Opts.PrespecializeGenericMetadata = true;
+  }
+
   if (const Arg *A = Args.getLastArg(OPT_read_legacy_type_info_path_EQ)) {
     Opts.ReadLegacyTypeInfoPath = A->getValue();
   }