Don't flatten every time we call CharCodeAt

src/handles.h

Index: src/handles.h
diff --git a/src/handles.h b/src/handles.h
index ed8a824cd8c370627993bc42e23c751c82ab0462..0c1a25452e8757bf16479f62c9dbf88bc98ec801 100644
--- a/src/handles.h
+++ b/src/handles.h
@@ -1,4 +1,4 @@
-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2011 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:
@@ -185,6 +185,9 @@ void FlattenString(Handle<String> str);
 // string.
 Handle<String> FlattenGetString(Handle<String> str);
 
+// Gets a single character code from a string. May try to flatten the string.
+uint16_t StringGetMayFlatten(Handle<String> str, int index);
+
 Handle<Object> SetProperty(Handle<JSObject> object,
                            Handle<String> key,
                            Handle<Object> value,