Fixed a couple of failing DCHECK(has_pending_exception()).

test/mjsunit/regress/regress-crbug-491062.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --harmony-arrow-functions
+// Flags: --allow-natives-syntax --stack-limit=32
 
-// This used to trigger crash because of an unhandled stack overflow.
+function g() {}
+
+var count = 0;
 function f() {
-  var a = [10];
   try {
     f();
   } catch(e) {
-    a.map(v => v + 1);
+    print(e.stack);
+  }
+  if (count < 50) {
+    count++;
+    %DebugGetLoadedScripts();
   }
 }
 f();
+g();