Strict mode poision pills.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 6e47946d128fc7957383f571e3b80b446e697665..d1ad2d06baeecd5a89bd0906442a3f86679e7387 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -5536,12 +5536,21 @@ MaybeObject* JSFunction::SetPrototype(Object* value) {
 
 
 Object* JSFunction::RemovePrototype() {
-  if (map() == context()->global_context()->function_without_prototype_map()) {
+  Map* no_prototype_map = shared()->strict_mode()
+      ? context()->global_context()->function_without_prototype_map_strict()
+      : context()->global_context()->function_without_prototype_map();
+
+  if (map() == no_prototype_map) {
     // Be idempotent.
     return this;
   }
-  ASSERT(map() == context()->global_context()->function_map());
-  set_map(context()->global_context()->function_without_prototype_map());
+
+  ASSERT(!shared()->strict_mode() ||
+         map() == context()->global_context()->function_map_strict());
+  ASSERT(shared()->strict_mode() ||
+         map() == context()->global_context()->function_map());
+
+  set_map(no_prototype_map);
   set_prototype_or_initial_map(Heap::the_hole_value());
   return this;
 }