Fix Function subclassing.

src/objects.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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 5797 matching lines @@
   // the ElementsKind set.
   static Handle<Map> TransitionElementsTo(Handle<Map> map,
                                           ElementsKind to_kind);
 
   static Handle<Map> AsElementsKind(Handle<Map> map, ElementsKind kind);
 
   static Handle<Map> CopyAsElementsKind(Handle<Map> map,
                                         ElementsKind kind,
                                         TransitionFlag flag);
 
+  static Handle<Map> AsLanguageMode(Handle<Map> initial_map,
+                                    LanguageMode language_mode);
+
+
   static Handle<Map> CopyForObserved(Handle<Map> map);
 
   static Handle<Map> CopyForPreventExtensions(Handle<Map> map,
                                               PropertyAttributes attrs_to_add,
                                               Handle<Symbol> transition_marker,
                                               const char* reason);
 
   static Handle<Map> FixProxy(Handle<Map> map, InstanceType type, int size);
 
 
@@ skipping 4849 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_