Remove the compiled_transitions flag and cleanup the unused code.

src/ic.h

Index: src/ic.h
diff --git a/src/ic.h b/src/ic.h
index c9f521f14508c5e20de3b778d67aa84b75373203..7820d407ec138a781f436fcd4fc3488c3597cd2b 100644
--- a/src/ic.h
+++ b/src/ic.h
@@ -649,8 +649,6 @@ class KeyedStoreIC: public StoreIC {
                                          StrictModeFlag strict_mode);
   static void GenerateGeneric(MacroAssembler* masm, StrictModeFlag strict_mode);
   static void GenerateNonStrictArguments(MacroAssembler* masm);
-  static void GenerateTransitionElementsSmiToDouble(MacroAssembler* masm);
-  static void GenerateTransitionElementsDoubleToObject(MacroAssembler* masm);
 
  protected:
   virtual Code::Kind kind() const { return Code::KEYED_STORE_IC; }