Added ability to remove prototype from function. In this case, [[Construct]] ...

src/objects.cc

Index: src/objects.cc
===================================================================
--- src/objects.cc	(revision 4462)
+++ src/objects.cc	(working copy)
@@ -4906,6 +4906,7 @@
 
 
 Object* JSFunction::SetPrototype(Object* value) {
+  ASSERT(should_have_prototype());
   Object* construct_prototype = value;
 
   // If the value is not a JSObject, store the value in the map's
@@ -4931,6 +4932,14 @@
 }
 
 
+Object* JSFunction::RemovePrototype() {
+  ASSERT(map() == context()->global_context()->function_map());
+  set_map(context()->global_context()->function_without_prototype_map());
+  set_prototype_or_initial_map(Heap::the_hole_value());
+  return this;
+}
+
+
 Object* JSFunction::SetInstanceClassName(String* name) {
   shared()->set_instance_class_name(name);
   return this;