Fix edge case in stack trace formatting.

src/messages.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 888 matching lines @@
   var script = %FunctionGetScript(this[CallSiteFunctionKey]);
   return script ? (script.type == TYPE_NATIVE) : false;
 }
 
 function CallSiteGetPosition() {
   return this[CallSitePositionKey];
 }
 
 function CallSiteIsConstructor() {
   var receiver = this[CallSiteReceiverKey];
-  var constructor =
-      IS_OBJECT(receiver) ? %GetDataProperty(receiver, "constructor") : null;
+  var constructor = (receiver != null && IS_OBJECT(receiver))
+                        ? %GetDataProperty(receiver, "constructor") : null;
   if (!constructor) return false;
   return this[CallSiteFunctionKey] === constructor;
 }
 
 function CallSiteToString() {
   var fileName;
   var fileLocation = "";
   if (this.isNative()) {
     fileLocation = "native";
   } else {
@@ skipping 404 matching lines @@
     %SetOverflowedStackTrace(this, void 0);
   }
 
   %DefineOrRedefineAccessorProperty(
       boilerplate, 'stack', getter, setter, DONT_ENUM);
 
   return boilerplate;
 }
 
 var kStackOverflowBoilerplate = SetUpStackOverflowBoilerplate();