[runtime] More LookupIterator / Transition related performance tweaks

src/field-type.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/field-type.h"
 
 #include "src/handles-inl.h"
 #include "src/ostreams.h"
 #include "src/types.h"
 
@@ skipping 27 matching lines @@
 Handle<FieldType> FieldType::Class(i::Handle<i::Map> map, Isolate* isolate) {
   return handle(Class(*map), isolate);
 }
 
 // static
 FieldType* FieldType::cast(Object* object) {
   DCHECK(object == None() || object == Any() || object->IsMap());
   return reinterpret_cast<FieldType*>(object);
 }
 
-bool FieldType::NowContains(Object* value) {
-  if (this == Any()) return true;
-  if (this == None()) return false;
-  if (!value->IsHeapObject()) return false;
-  return HeapObject::cast(value)->map() == Map::cast(this);
-}
-
-bool FieldType::NowContains(Handle<Object> value) {
-  return NowContains(*value);
-}
-
 bool FieldType::IsClass() { return this->IsMap(); }
 
 Handle<i::Map> FieldType::AsClass() {
   DCHECK(IsClass());
   i::Map* map = Map::cast(this);
   return handle(map, map->GetIsolate());
 }
 
 bool FieldType::NowStable() {
   return !this->IsClass() || this->AsClass()->is_stable();
@@ skipping 24 matching lines @@
   } else if (IsNone()) {
     os << "None";
   } else {
     DCHECK(IsClass());
     os << "Class(" << static_cast<void*>(*AsClass()) << ")";
   }
 }
 
 }  // namespace internal
 }  // namespace v8