Add generated code for ascii string comparison...

src/x64/codegen-x64.h

 // Copyright 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
@@ skipping 526 matching lines @@
 
   // Fast support for Math.random().
   void GenerateRandomPositiveSmi(ZoneList<Expression*>* args);
 
   // Fast support for StringAdd.
   void GenerateStringAdd(ZoneList<Expression*>* args);
 
   // Fast support for SubString.
   void GenerateSubString(ZoneList<Expression*>* args);
 
+  // Fast support for StringCompare.
+  void GenerateStringCompare(ZoneList<Expression*>* args);
+
   // Support for direct calls from JavaScript to native RegExp code.
   void GenerateRegExpExec(ZoneList<Expression*>* args);
 
   // Simple condition analysis.
   enum ConditionAnalysis {
     ALWAYS_TRUE,
     ALWAYS_FALSE,
     DONT_KNOW
   };
   ConditionAnalysis AnalyzeCondition(Expression* cond);
@@ skipping 216 matching lines @@
                               bool ascii);
 
   // Should the stub check whether arguments are strings?
   bool string_check_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_CODEGEN_X64_H_