Don't call into JS from within stack trace generation

src/js/messages.js

 // Copyright 2012 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.
 
 // -------------------------------------------------------------------
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
@@ skipping 228 matching lines @@
  * If sourceURL comment is available returns sourceURL comment contents.
  * Otherwise, script name is returned. See
  * http://fbug.googlecode.com/svn/branches/firebug1.1/docs/ReleaseNotes_1.1.txt
  * and Source Map Revision 3 proposal for details on using //# sourceURL and
  * deprecated //@ sourceURL comment to identify scripts that don't have name.
  *
  * @return {?string} script name if present, value for //# sourceURL comment or
  * deprecated //@ sourceURL comment otherwise.
  */
 function ScriptNameOrSourceURL() {
+  // Keep in sync with Script::GetNameOrSourceURL.
   if (this.source_url) return this.source_url;
   return this.name;
 }
 
 
 utils.SetUpLockedPrototype(Script, [
     "source",
     "name",
     "source_url",
     "source_mapping_url",
@@ skipping 497 matching lines @@
 utils.Export(function(to) {
   to.ErrorToString = ErrorToString;
   to.MakeError = MakeError;
   to.MakeRangeError = MakeRangeError;
   to.MakeSyntaxError = MakeSyntaxError;
   to.MakeTypeError = MakeTypeError;
   to.MakeURIError = MakeURIError;
 });
 
 });