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

src/stub-cache.h

Index: src/stub-cache.h
diff --git a/src/stub-cache.h b/src/stub-cache.h
index 45aaf75c91796a35ad6fbb29330eed2df088e5c2..7db6eb41d473d3e9e618e63ed919a0b6000a963c 100644
--- a/src/stub-cache.h
+++ b/src/stub-cache.h
@@ -568,9 +568,11 @@ class KeyedStoreStubCompiler: public StubCompiler {
 // a builtin function on its instance prototype (the one the generator
 // is set for), and a name of a generator itself (used to build ids
 // and generator function names).
-#define CUSTOM_CALL_IC_GENERATORS(V) \
-  V(array, push, ArrayPush) \
-  V(array, pop, ArrayPop)
+#define CUSTOM_CALL_IC_GENERATORS(V)      \
+  V(array, push, ArrayPush)               \
+  V(array, pop, ArrayPop)                 \
+  V(string, charCodeAt, StringCharCodeAt) \
+  V(string, charAt, StringCharAt)
 
 
 class CallStubCompiler: public StubCompiler {