Merge pull request #76363 from DmT021/wp/print-diagnostic-groups

[Diagnostics] Add -print-diagnostic-groups flag

lib/PrintAsClang/ModuleContentsWriter.cpp

@@ -973,7 +973,7 @@ public:
         // Emit a specific unavailable message when we know why a decl can't be
         // exposed, or a generic message otherwise.
         auto diagString = M.getASTContext().Diags.diagnosticStringFor(
-            diag.getID(), /*PrintDiagnosticNames=*/false);
+            diag.getID(), PrintDiagnosticNamesMode::None);
         DiagnosticEngine::formatDiagnosticText(os, diagString, diag.getArgs(),
                                                DiagnosticFormatOptions());
         os << "\");\n";