Replace generic KeyedStore stub with megamorphic version

src/ic/ic.h

Index: src/ic/ic.h
diff --git a/src/ic/ic.h b/src/ic/ic.h
index d41c37452f70eb9293297712fba161f7e23170f9..80d25060413ee6525a69ee04ae1628c7505ed44c 100644
--- a/src/ic/ic.h
+++ b/src/ic/ic.h
@@ -561,11 +561,8 @@ class StoreIC : public IC {
                       JSReceiver::StoreFromKeyed store_mode);
 
  protected:
-  Handle<Code> megamorphic_stub() OVERRIDE;
-
   // Stub accessors.
-  Handle<Code> generic_stub() const;
-
+  Handle<Code> megamorphic_stub() OVERRIDE;
   Handle<Code> slow_stub() const;
 
   virtual Handle<Code> pre_monomorphic_stub() const {
@@ -640,7 +637,6 @@ class KeyedStoreIC : public StoreIC {
   static void GenerateMiss(MacroAssembler* masm);
   static void GenerateSlow(MacroAssembler* masm);
   static void GenerateMegamorphic(MacroAssembler* masm, StrictMode strict_mode);
-  static void GenerateGeneric(MacroAssembler* masm, StrictMode strict_mode);
   static void GenerateSloppyArguments(MacroAssembler* masm);
 
  protected: