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

src/ic.cc

Index: src/ic.cc
===================================================================
--- src/ic.cc	(revision 4462)
+++ src/ic.cc	(working copy)
@@ -615,7 +615,8 @@
     }
 
     // Use specialized code for getting prototype of functions.
-    if (object->IsJSFunction() && name->Equals(Heap::prototype_symbol())) {
+    if (object->IsJSFunction() && name->Equals(Heap::prototype_symbol()) &&
+        JSFunction::cast(*object)->should_have_prototype()) {
 #ifdef DEBUG
       if (FLAG_trace_ic) PrintF("[LoadIC : +#prototype /function]\n");
 #endif
@@ -824,7 +825,8 @@
       }
 
       // Use specialized code for getting prototype of functions.
-      if (object->IsJSFunction() && name->Equals(Heap::prototype_symbol())) {
+      if (object->IsJSFunction() && name->Equals(Heap::prototype_symbol()) &&
+        JSFunction::cast(*object)->should_have_prototype()) {
         Handle<JSFunction> function = Handle<JSFunction>::cast(object);
         Object* code =
             StubCache::ComputeKeyedLoadFunctionPrototype(*name, *function);