Remove HandlerKindField and just encode the handlerkind as the only extra-ic-state.

src/ic.h

Index: src/ic.h
diff --git a/src/ic.h b/src/ic.h
index 99309f4edf261a53871bd9f9e031016c2e69f4b7..213a48182635badf5c833729e0d8d143e999b6c8 100644
--- a/src/ic.h
+++ b/src/ic.h
@@ -320,8 +320,7 @@ class LoadIC: public IC {
     GenerateMiss(masm);
   }
   static void GenerateMiss(MacroAssembler* masm);
-  static void GenerateMegamorphic(MacroAssembler* masm,
-                                  ExtraICState extra_state);
+  static void GenerateMegamorphic(MacroAssembler* masm);
   static void GenerateNormal(MacroAssembler* masm);
   static void GenerateRuntimeGetProperty(MacroAssembler* masm);
 
@@ -482,8 +481,7 @@ class StoreIC: public IC {
     GenerateMiss(masm);
   }
   static void GenerateMiss(MacroAssembler* masm);
-  static void GenerateMegamorphic(MacroAssembler* masm,
-                                  ExtraICState extra_ic_state);
+  static void GenerateMegamorphic(MacroAssembler* masm);
   static void GenerateNormal(MacroAssembler* masm);
   static void GenerateRuntimeSetProperty(MacroAssembler* masm,
                                          StrictModeFlag strict_mode);