[proxies] fix access issue when having proxies on the prototype-chain of global objects.

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.
 //
@@ skipping 1169 matching lines @@
   MAYBE_RETURN_NULL(
       SetProperty(&it, value, language_mode, MAY_BE_STORE_FROM_KEYED));
   return value;
 }
 
 
 MaybeHandle<Object> Object::GetPrototype(Isolate* isolate,
                                          Handle<Object> receiver) {
   // We don't expect access checks to be needed on JSProxy objects.
   DCHECK(!receiver->IsAccessCheckNeeded() || receiver->IsJSObject());
-  Handle<Context> context(isolate->context());
-  if (receiver->IsAccessCheckNeeded() &&
-      !isolate->MayAccess(context, Handle<JSObject>::cast(receiver))) {
-    return isolate->factory()->null_value();
-  }
   PrototypeIterator iter(isolate, receiver,
                          PrototypeIterator::START_AT_RECEIVER);
   do {
+    if (!iter.HasAccess()) return isolate->factory()->null_value();
     if (!iter.AdvanceFollowingProxies()) return MaybeHandle<Object>();
   } while (!iter.IsAtEnd(PrototypeIterator::END_AT_NON_HIDDEN));
   return PrototypeIterator::GetCurrent(iter);
 }
 
 
 MaybeHandle<Object> Object::GetProperty(Isolate* isolate, Handle<Object> object,
                                         const char* name,
                                         LanguageMode language_mode) {
   Handle<String> str = isolate->factory()->InternalizeUtf8String(name);
@@ skipping 6679 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_