A couple of other "stack overflow" vs. "has_pending_exception()" issues in debugger fixed.

test/mjsunit/regress/regress-crbug-505007-1.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: --stack-size=100
+// Flags: --stack-size=100 --allow-natives-syntax
 
 function f() {
   try {
     f();
   } catch(e) {
-    Realm.create();
+    %GetDebugContext();
   }
 }
 f();