Added special case for atomic regular expressions.

src/objects.h

 // Copyright 2006-2008 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 2794 matching lines @@
   static const int kSize = kValueOffset + kPointerSize;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSValue);
 };
 
 
 // Regular expressions
 class JSRegExp: public JSObject {
  public:
-  enum Type { JSCRE, INDEX_OF };
+  enum Type { JSCRE, ATOM };
 
   inline Type type_tag();
   inline void set_type_tag(Type value);
 
   DECL_ACCESSORS(type, Object)
   DECL_ACCESSORS(data, Object)
 
   static inline JSRegExp* cast(Object* obj);
 
   // Dispatched behavior.
@@ skipping 1083 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_