Use a dictionary-mode code cache on the map rather than a dual system.

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index e98fb47a74c4224a54cab9018997f58b74de43da..88f42dd791127cb49b758220b4fccd1b3c3d9d42 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -4457,26 +4457,6 @@ static void Generate_KeyedStoreIC_Miss(MacroAssembler* masm) {
 }
 
 
-static void Generate_KeyedStoreIC_Initialize(MacroAssembler* masm) {
-  KeyedStoreIC::GenerateInitialize(masm);
-}
-
-
-static void Generate_KeyedStoreIC_Initialize_Strict(MacroAssembler* masm) {
-  KeyedStoreIC::GenerateInitialize(masm);
-}
-
-
-static void Generate_KeyedStoreIC_PreMonomorphic(MacroAssembler* masm) {
-  KeyedStoreIC::GeneratePreMonomorphic(masm);
-}
-
-
-static void Generate_KeyedStoreIC_PreMonomorphic_Strict(MacroAssembler* masm) {
-  KeyedStoreIC::GeneratePreMonomorphic(masm);
-}
-
-
 static void Generate_Return_DebugBreak(MacroAssembler* masm) {
   DebugCodegen::GenerateDebugBreakStub(masm,
                                        DebugCodegen::SAVE_RESULT_REGISTER);