Optimize Object.seal and Object.preventExtensions

src/globals.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.
 
 #ifndef V8_GLOBALS_H_
 #define V8_GLOBALS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 326 matching lines @@
 class Object;
 class OldSpace;
 class Foreign;
 class Scope;
 class ScopeInfo;
 class Script;
 class Smi;
 template <typename Config, class Allocator = FreeStoreAllocationPolicy>
     class SplayTree;
 class String;
+class Symbol;
 class Name;
 class Struct;
 class Symbol;
 class Variable;
 class RelocInfo;
 class Deserializer;
 class MessageLocation;
 
 typedef bool (*WeakSlotCallback)(Object** pointer);
 
@@ skipping 450 matching lines @@
   DCHECK(IsValidFunctionKind(kind));
   return kind & FunctionKind::kDefaultConstructor;
 }
 
 
 } }  // namespace v8::internal
 
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_