[parser] better error message for generator constructors

src/preparser.h

Index: src/preparser.h
diff --git a/src/preparser.h b/src/preparser.h
index 4a35cd59f52dfa71426abc71f58937ce3d783f86..7df271f6baad4152aa359f3377e6d5609b97bbe6 100644
--- a/src/preparser.h
+++ b/src/preparser.h
@@ -3106,7 +3106,9 @@ void ParserBase<Traits>::ClassLiteralChecker::CheckProperty(
     }
   } else if (IsConstructor()) {
     if (is_generator || type == kAccessorProperty) {
-      this->parser()->ReportMessage("constructor_special_method");
+      const char* msg =
+          is_generator ? "constructor_is_generator" : "constructor_is_accessor";
+      this->parser()->ReportMessage(msg);
       *ok = false;
       return;
     }