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

src/full-codegen.h

Index: src/full-codegen.h
diff --git a/src/full-codegen.h b/src/full-codegen.h
index c7d009371245e36f922b0c8162375b11f574ade4..e9a05be622271cc89e9182a18bdd5028f9a9ea99 100644
--- a/src/full-codegen.h
+++ b/src/full-codegen.h
@@ -388,8 +388,9 @@ class FullCodeGenerator: public AstVisitor {
   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);