Fix cluster-fuzz regression with Workers on mips.debug

test/mjsunit/regress/regress-crbug-503698.js

Index: test/mjsunit/regress/regress-crbug-503698.js
diff --git a/test/mjsunit/compiler/regress-416359.js b/test/mjsunit/regress/regress-crbug-503698.js
similarity index 61%
copy from test/mjsunit/compiler/regress-416359.js
copy to test/mjsunit/regress/regress-crbug-503698.js
index 18cdc5e72800ab16c49ea2f2091b88ba1c873248..274eb5a99e9bc392107d933400f1ff2a3aab0e13 100644
--- a/test/mjsunit/compiler/regress-416359.js
+++ b/test/mjsunit/regress/regress-crbug-503698.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.
 
-"use strict"
-function f() {
-  for (x in {a:0});
-}
+// Flags: --invoke-weak-callbacks
 
-assertThrows(f);
+if (this.Worker) {
+  function __f_1() {}
+  var __v_6 = new Worker(__f_1);
+}