Make sure that the prototype of the initial map is created in the...

src/heap.cc

Index: src/heap.cc
===================================================================
--- src/heap.cc	(revision 1154)
+++ src/heap.cc	(working copy)
@@ -1724,9 +1724,12 @@
 
 
 Object* Heap::AllocateFunctionPrototype(JSFunction* function) {
-  // Allocate the prototype.
-  Object* prototype =
-      AllocateJSObject(Top::context()->global_context()->object_function());
+  // Allocate the prototype.  Make sure to use the object function
+  // from the function's context, since the function can be from a
+  // different context.
+  JSFunction* object_function =
+      function->context()->global_context()->object_function();
+  Object* prototype = AllocateJSObject(object_function);
   if (prototype->IsFailure()) return prototype;
   // When creating the prototype for the function we must set its
   // constructor to the function.