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

src/objects-inl.h

Index: src/objects-inl.h
===================================================================
--- src/objects-inl.h	(revision 4462)
+++ src/objects-inl.h	(working copy)
@@ -2113,6 +2113,20 @@
 }
 
 
+void Map::set_function_with_prototype(bool value) {
+  if (value) {
+    set_bit_field2(bit_field2() | (1 << kFunctionWithPrototype));
+  } else {
+    set_bit_field2(bit_field2() & ~(1 << kFunctionWithPrototype));
+  }
+}
+
+
+bool Map::function_with_prototype() {
+  return ((1 << kFunctionWithPrototype) & bit_field2()) != 0;
+}
+
+
 void Map::set_is_access_check_needed(bool access_check_needed) {
   if (access_check_needed) {
     set_bit_field(bit_field() | (1 << kIsAccessCheckNeeded));
@@ -2568,7 +2582,11 @@
   return instance_prototype();
 }
 
+bool JSFunction::should_have_prototype() {
+  return map()->function_with_prototype();
+}
 
+
 bool JSFunction::is_compiled() {
   return shared()->is_compiled();
 }