Replace generic KeyedStore stub with megamorphic version

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index 782d4141c933ec411a7db8d36692731aef8047fe..6fea01411723603a35d3eda984168ace1d2cea70 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -1295,16 +1295,6 @@ static void Generate_KeyedStoreIC_Megamorphic_Strict(MacroAssembler* masm) {
 }
 
 
-static void Generate_KeyedStoreIC_Generic(MacroAssembler* masm) {
-  KeyedStoreIC::GenerateGeneric(masm, SLOPPY);
-}
-
-
-static void Generate_KeyedStoreIC_Generic_Strict(MacroAssembler* masm) {
-  KeyedStoreIC::GenerateGeneric(masm, STRICT);
-}
-
-
 static void Generate_KeyedStoreIC_Miss(MacroAssembler* masm) {
   KeyedStoreIC::GenerateMiss(masm);
 }