Merge pull request #10907 from CodaFi/mangolia

Author: swift-ci

stdlib/public/runtime/Reflection.mm

@@ -1210,9 +1210,8 @@ static Mirror ObjC_getMirrorForSuperclass(Class sup,
 
   // Check if we are dealing with Swift mangled name, otherwise, don't try
   // to demangle and send indication to the user.
-  if (mangledName[0] != '_' || mangledName[1] != 'T') {
-    return nullptr;
-  }
+  if (!Demangle::isSwiftSymbol(mangledName))
+    return nullptr; // Not a mangled name
 
   // Demangle the name.
   auto options = Demangle::DemangleOptions();