Custom call IC-s for String.prototype.{charAt,charCodeAt}.

src/full-codegen.h

 // Copyright 2010 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 370 matching lines @@
   void EmitIsArray(ZoneList<Expression*>* arguments);
   void EmitIsRegExp(ZoneList<Expression*>* arguments);
   void EmitIsConstructCall(ZoneList<Expression*>* arguments);
   void EmitObjectEquals(ZoneList<Expression*>* arguments);
   void EmitArguments(ZoneList<Expression*>* arguments);
   void EmitArgumentsLength(ZoneList<Expression*>* arguments);
   void EmitClassOf(ZoneList<Expression*>* arguments);
   void EmitValueOf(ZoneList<Expression*>* arguments);
   void EmitSetValueOf(ZoneList<Expression*>* arguments);
   void EmitNumberToString(ZoneList<Expression*>* arguments);
-  void EmitCharFromCode(ZoneList<Expression*>* arguments);
-  void EmitFastCharCodeAt(ZoneList<Expression*>* arguments);
+  void EmitStringCharFromCode(ZoneList<Expression*>* arguments);
+  void EmitStringCharCodeAt(ZoneList<Expression*>* arguments);
+  void EmitStringCharAt(ZoneList<Expression*>* arguments);
   void EmitStringCompare(ZoneList<Expression*>* arguments);
   void EmitStringAdd(ZoneList<Expression*>* arguments);
   void EmitLog(ZoneList<Expression*>* arguments);
   void EmitRandomHeapNumber(ZoneList<Expression*>* arguments);
   void EmitSubString(ZoneList<Expression*>* arguments);
   void EmitRegExpExec(ZoneList<Expression*>* arguments);
   void EmitMathPow(ZoneList<Expression*>* arguments);
   void EmitMathSin(ZoneList<Expression*>* arguments);
   void EmitMathCos(ZoneList<Expression*>* arguments);
   void EmitMathSqrt(ZoneList<Expression*>* arguments);
@@ skipping 107 matching lines @@
 
   friend class NestedStatement;
 
   DISALLOW_COPY_AND_ASSIGN(FullCodeGenerator);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FULL_CODEGEN_H_