Fix cluster-fuzz found regression in d8 Workers.

test/mjsunit/regress/regress-crbug-504727.js

Index: test/mjsunit/regress/regress-crbug-504727.js
diff --git a/test/mjsunit/regress/regress-crbug-503698.js b/test/mjsunit/regress/regress-crbug-504727.js
similarity index 68%
copy from test/mjsunit/regress/regress-crbug-503698.js
copy to test/mjsunit/regress/regress-crbug-504727.js
index 274eb5a99e9bc392107d933400f1ff2a3aab0e13..7413f8105881c6557cf8b98ec376bee09e6549d5 100644
--- a/test/mjsunit/regress/regress-crbug-503698.js
+++ b/test/mjsunit/regress/regress-crbug-504727.js
@@ -2,9 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --invoke-weak-callbacks
+// Flags: --no-test
 
 if (this.Worker) {
-  function __f_1() {}
-  var __v_6 = new Worker(__f_1);
+  function __f_4() {}
+  var __v_2 = new Worker(__f_4);
 }