Introduce a PrototypeIterator template and use it all over the place

src/objects-inl.h

 // Copyright 2012 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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
 
 #ifndef V8_OBJECTS_INL_H_
 #define V8_OBJECTS_INL_H_
 
 #include "src/base/atomicops.h"
 #include "src/contexts.h"
 #include "src/conversions-inl.h"
 #include "src/elements.h"
 #include "src/factory.h"
 #include "src/field-index-inl.h"
 #include "src/heap-inl.h"
 #include "src/heap.h"
 #include "src/incremental-marking.h"
 #include "src/isolate.h"
 #include "src/lookup.h"
 #include "src/objects.h"
 #include "src/objects-visiting.h"
 #include "src/property.h"
+#include "src/prototype-iterator.h"
 #include "src/spaces.h"
 #include "src/store-buffer.h"
 #include "src/transitions-inl.h"
 #include "src/v8memory.h"
 
 namespace v8 {
 namespace internal {
 
 PropertyDetails::PropertyDetails(Smi* smi) {
   value_ = smi->value();
@@ skipping 6449 matching lines @@
       Handle<JSObject>::cast(object), object, index, true);
 }
 
 
 bool JSGlobalObject::IsDetached() {
   return JSGlobalProxy::cast(global_receiver())->IsDetachedFrom(this);
 }
 
 
 bool JSGlobalProxy::IsDetachedFrom(GlobalObject* global) {
-  return GetPrototype() != global;
+  return SAFE_GET_PROTOTYPE_FAST(this) != global;
 }
 
 
 Handle<Smi> JSReceiver::GetOrCreateIdentityHash(Handle<JSReceiver> object) {
   return object->IsJSProxy()
       ? JSProxy::GetOrCreateIdentityHash(Handle<JSProxy>::cast(object))
       : JSObject::GetOrCreateIdentityHash(Handle<JSObject>::cast(object));
 }
 
 
@@ skipping 492 matching lines @@
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_