A little peephole optimization for the Irregexp bytecode interpreter.

src/regexp-macro-assembler-irregexp.h

-// Copyright 2008 the V8 project authors. All rights reserved.
+// Copyright 2008-2009 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
 //       with the distribution.
@@ skipping 114 matching lines @@
   void Copy(Address a);
 
   // The buffer into which code and relocation info are generated.
   Vector<byte> buffer_;
   // The program counter.
   int pc_;
   // True if the assembler owns the buffer, false if buffer is external.
   bool own_buffer_;
   Label backtrack_;
 
+  int advance_current_start_;
+  int advance_current_offset_;
+  int advance_current_end_;
+
+  static const int kInvalidPC = -1;
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(RegExpMacroAssemblerIrregexp);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_REGEXP_MACRO_ASSEMBLER_IRREGEXP_H_