Revert part of 11727 as it sometimes tanked V8 benchmark (raytrace) performance

src/objects-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1598 matching lines @@
 bool JSObject::TooManyFastProperties(int properties,
                                      JSObject::StoreFromKeyed store_mode) {
   // Allow extra fast properties if the object has more than
   // kFastPropertiesSoftLimit in-object properties. When this is the case,
   // it is very unlikely that the object is being used as a dictionary
   // and there is a good chance that allowing more map transitions
   // will be worth it.
   int inobject = map()->inobject_properties();
 
   int limit;
-  if (store_mode == CERTAINLY_NOT_STORE_FROM_KEYED ||
-      map()->used_for_prototype()) {
+  if (store_mode == CERTAINLY_NOT_STORE_FROM_KEYED) {
     limit = Max(inobject, kMaxFastProperties);
   } else {
     limit = Max(inobject, kFastPropertiesSoftLimit);
   }
   return properties > limit;
 }
 
 
 void Struct::InitializeBody(int object_size) {
   Object* value = GetHeap()->undefined_value();
@@ skipping 1344 matching lines @@
   } else {
     set_bit_field3(bit_field3() & ~(1 << kIsShared));
   }
 }
 
 bool Map::is_shared() {
   return ((1 << kIsShared) & bit_field3()) != 0;
 }
 
 
-void Map::set_used_for_prototype(bool value) {
-  if (value) {
-    set_bit_field3(bit_field3() | (1 << kUsedForPrototype));
-  } else {
-    set_bit_field3(bit_field3() & ~(1 << kUsedForPrototype));
-  }
-}
-
-
-bool Map::used_for_prototype() {
-  return ((1 << kUsedForPrototype) & bit_field3()) != 0;
-}
-
-
 JSFunction* Map::unchecked_constructor() {
   return reinterpret_cast<JSFunction*>(READ_FIELD(this, kConstructorOffset));
 }
 
 
 Code::Flags Code::flags() {
   return static_cast<Flags>(READ_INT_FIELD(this, kFlagsOffset));
 }
 
 
@@ skipping 2183 matching lines @@
 #undef WRITE_UINT32_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_