Use POLYMORPHIC for polymorphic Keyed(Load|Store)IC

src/type-info.h

Index: src/type-info.h
diff --git a/src/type-info.h b/src/type-info.h
index 8b2ec49310de9730da50a790d7b8093f0eb9e41e..330ecd34c32effa0efb6dd6c4836bb62147d80bb 100644
--- a/src/type-info.h
+++ b/src/type-info.h
@@ -242,9 +242,9 @@ class TypeFeedbackOracle: public ZoneObject {
 
   bool LoadIsMonomorphicNormal(Property* expr);
   bool LoadIsUninitialized(Property* expr);
-  bool LoadIsMegamorphicWithTypeInfo(Property* expr);
+  bool LoadIsPolymorphic(Property* expr);
   bool StoreIsMonomorphicNormal(TypeFeedbackId ast_id);
-  bool StoreIsMegamorphicWithTypeInfo(TypeFeedbackId ast_id);
+  bool StoreIsPolymorphic(TypeFeedbackId ast_id);
   bool CallIsMonomorphic(Call* expr);
   bool CallNewIsMonomorphic(CallNew* expr);
   bool ObjectLiteralStoreIsMonomorphic(ObjectLiteral::Property* prop);