Make not sucking at regexp the default...

src/regexp-macro-assembler.h

 // Copyright 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 143 matching lines @@
   virtual void ReadCurrentPositionFromRegister(int reg) = 0;
   virtual void ReadStackPointerFromRegister(int reg) = 0;
   virtual void SetRegister(int register_index, int to) = 0;
   virtual void Succeed() = 0;
   virtual void WriteCurrentPositionToRegister(int reg, int cp_offset) = 0;
   virtual void ClearRegisters(int reg_from, int reg_to) = 0;
   virtual void WriteStackPointerToRegister(int reg) = 0;
 };
 
 
-#ifdef V8_NATIVE_REGEXP  // Avoid compiling unused code.
+#ifndef V8_INTERPRETED_REGEXP  // Avoid compiling unused code.
 
 class NativeRegExpMacroAssembler: public RegExpMacroAssembler {
  public:
   // Type of input string to generate code for.
   enum Mode { ASCII = 1, UC16 = 2 };
 
   // Result of calling generated native RegExp code.
   // RETRY: Something significant changed during execution, and the matching
   //        should be retried from scratch.
   // EXCEPTION: Something failed during execution. If no exception has been
@@ skipping 39 matching lines @@
   }
 
   static Result Execute(Code* code,
                         String* input,
                         int start_offset,
                         const byte* input_start,
                         const byte* input_end,
                         int* output);
 };
 
-#endif  // V8_NATIVE_REGEXP
+#endif  // V8_INTERPRETED_REGEXP
 
 } }  // namespace v8::internal
 
 #endif  // V8_REGEXP_MACRO_ASSEMBLER_H_