Don't exchange null and undefined with the global object in function.prototype.{call, apply} for ...

src/messages.js

Index: src/messages.js
===================================================================
--- src/messages.js	(revision 7676)
+++ src/messages.js	(working copy)
@@ -1069,6 +1069,9 @@
 }
 
 function errorToString() {
+  if (IS_NULL_OR_UNDEFINED(this)) {
+    throw MakeTypeError("obj_ctor_property_non_object", ["toString"]);
+  }
   // This helper function is needed because access to properties on
   // the builtins object do not work inside of a catch clause.
   function isCyclicErrorMarker(o) { return o === cyclic_error_marker; }