Attempt to make \b\w+ faster. Slight performance increase on, e.g., string unpacking.

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 105 matching lines @@
   // Checks whether the given offset from the current position is before
   // the end of the string.  May overwrite the current character.
   virtual void CheckPosition(int cp_offset, Label* on_outside_input) {
     LoadCurrentCharacter(cp_offset, on_outside_input, true);
   }
   // Check whether a standard/default character class matches the current
   // character. Returns false if the type of special character class does
   // not have custom support.
   // May clobber the current loaded character.
   virtual bool CheckSpecialCharacterClass(uc16 type,
-                                          int cp_offset,
-                                          bool check_offset,
                                           Label* on_no_match) {
     return false;
   }
   virtual void Fail() = 0;
   virtual Handle<Object> GetCode(Handle<String> source) = 0;
   virtual void GoTo(Label* label) = 0;
   // Check whether a register is >= a given constant and go to a label if it
   // is.  Backtracks instead if the label is NULL.
   virtual void IfRegisterGE(int reg, int comparand, Label* if_ge) = 0;
   // Check whether a register is < a given constant and go to a label if it is.
@@ skipping 75 matching lines @@
                         const byte* input_end,
                         int* output,
                         bool at_start);
 };
 
 #endif  // V8_NATIVE_REGEXP
 
 } }  // namespace v8::internal
 
 #endif  // V8_REGEXP_MACRO_ASSEMBLER_H_