Distinguish keyed loads with a symbol key from fast elements loads.

src/type-info.h

Index: src/type-info.h
===================================================================
--- src/type-info.h	(revision 8274)
+++ src/type-info.h	(working copy)
@@ -215,8 +215,8 @@
  public:
   TypeFeedbackOracle(Handle<Code> code, Handle<Context> global_context);
 
-  bool LoadIsMonomorphic(Property* expr);
-  bool StoreIsMonomorphic(Expression* expr);
+  bool LoadIsMonomorphicNormal(Property* expr);
+  bool StoreIsMonomorphicNormal(Expression* expr);
   bool CallIsMonomorphic(Call* expr);
 
   Handle<Map> LoadMonomorphicReceiverType(Property* expr);