Remove special charAt and charCodeAt handling in the ICs.

src/ic.h

Index: src/ic.h
diff --git a/src/ic.h b/src/ic.h
index 2b258ba2e9e9badedb667bab0b4bb5921f91f88e..a253017dfd0366289c440cb8fed9c1415dc5cfb0 100644
--- a/src/ic.h
+++ b/src/ic.h
@@ -283,20 +283,8 @@ class IC_Utility {
 };
 
 
-enum StringStubFeedback {
-  DEFAULT_STRING_STUB = 0,
-  STRING_INDEX_OUT_OF_BOUNDS = 1
-};
-
-
 class CallICBase: public IC {
  public:
-  // ExtraICState bits
-  class StringStubState: public BitField<StringStubFeedback, 0, 1> {};
-  static ExtraICState ComputeExtraICState(StringStubFeedback feedback) {
-    return StringStubState::encode(feedback);
-  }
-
   // Returns a JSFunction or a Failure.
   MUST_USE_RESULT MaybeObject* LoadFunction(Handle<Object> object,
                                             Handle<String> name);