A little peephole optimization for the Irregexp bytecode interpreter.

src/regexp-macro-assembler-irregexp.h

Index: src/regexp-macro-assembler-irregexp.h
===================================================================
--- src/regexp-macro-assembler-irregexp.h	(revision 1305)
+++ src/regexp-macro-assembler-irregexp.h	(working copy)
@@ -1,4 +1,4 @@
-// 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:
@@ -133,6 +133,12 @@
   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);
 };