Reland "Create internal fields on global proxy objects"

src/api-natives.cc

 // Copyright 2015 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/api-natives.h"
 
 #include "src/api.h"
 #include "src/isolate-inl.h"
 #include "src/lookup.h"
 #include "src/messages.h"
@@ skipping 623 matching lines @@
       }
       instance_size += JSObject::kHeaderSize;
       break;
     case GlobalObjectType:
       type = JS_GLOBAL_OBJECT_TYPE;
       instance_size += JSGlobalObject::kSize;
       break;
     case GlobalProxyType:
       type = JS_GLOBAL_PROXY_TYPE;
       instance_size += JSGlobalProxy::kSize;
+      DCHECK_EQ(instance_size, JSGlobalProxy::kSizeWithInternalFields);
       break;
     default:
       UNREACHABLE();
       type = JS_OBJECT_TYPE;  // Keep the compiler happy.
       break;
   }
 
   Handle<Map> map =
       isolate->factory()->NewMap(type, instance_size, FAST_HOLEY_SMI_ELEMENTS);
   JSFunction::SetInitialMap(result, map, Handle<JSObject>::cast(prototype));
@@ skipping 20 matching lines @@
   if (!obj->instance_call_handler()->IsUndefined(isolate)) {
     map->set_is_callable();
     map->set_is_constructor(true);
   }
 
   return result;
 }
 
 }  // namespace internal
 }  // namespace v8