Fix build with gcc 4.8 on Linux.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4000 matching lines @@
                   PropertyAttributes filter,
                   SortMode sort_mode);
 
   // Accessors for next enumeration index.
   void SetNextEnumerationIndex(int index) {
     ASSERT(index != 0);
     this->set(kNextEnumerationIndexIndex, Smi::FromInt(index));
   }
 
   int NextEnumerationIndex() {
-    return Smi::cast(FixedArray::get(kNextEnumerationIndexIndex))->value();
+    return Smi::cast(this->get(kNextEnumerationIndexIndex))->value();
   }
 
   // Returns a new array for dictionary usage. Might return Failure.
   MUST_USE_RESULT static MaybeObject* Allocate(
       Heap* heap,
       int at_least_space_for,
       PretenureFlag pretenure = NOT_TENURED);
 
   // Ensure enough space for n additional elements.
   MUST_USE_RESULT MaybeObject* EnsureCapacity(int n, Key key);
@@ skipping 6981 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_