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 d19f71a332bad9e9fc5b50dae22f230fc90a96bb..ed8fbf3cd9d76ffdbc4f8c0ec4640999ed45f8fb 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -4535,26 +4535,6 @@ 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);