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

src/ic/handler-compiler.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_IC_HANDLER_COMPILER_H_
 #define V8_IC_HANDLER_COMPILER_H_
 
 #include "src/ic/access-compiler.h"
 #include "src/ic/ic-state.h"
 
 namespace v8 {
 namespace internal {
 
 class CallOptimization;
 
 enum PrototypeCheckType { CHECK_ALL_MAPS, SKIP_RECEIVER };
 enum ReturnHolder { RETURN_HOLDER, DONT_RETURN_ANYTHING };
 
 class PropertyHandlerCompiler : public PropertyAccessCompiler {
  public:
   static Handle<Code> Find(Handle<Name> name, Handle<Map> map, Code::Kind kind,
-                           CacheHolderFlag cache_holder, Code::StubType type);
+                           CacheHolderFlag cache_holder);
 
  protected:
   PropertyHandlerCompiler(Isolate* isolate, Code::Kind kind, Handle<Map> map,
                           Handle<JSObject> holder, CacheHolderFlag cache_holder)
       : PropertyAccessCompiler(isolate, kind, cache_holder),
         map_(map),
         holder_(holder) {}
 
   virtual ~PropertyHandlerCompiler() {}
 
@@ skipping 58 matching lines @@
   //
   // The scratch and holder registers are always clobbered, but the object
   // register is only clobbered if it the same as the holder register. The
   // function returns a register containing the holder - either object_reg or
   // holder_reg.
   Register CheckPrototypes(Register object_reg, Register holder_reg,
                            Register scratch1, Register scratch2,
                            Handle<Name> name, Label* miss,
                            PrototypeCheckType check, ReturnHolder return_what);
 
-  Handle<Code> GetCode(Code::Kind kind, Code::StubType type, Handle<Name> name);
+  Handle<Code> GetCode(Code::Kind kind, Handle<Name> name);
   void set_holder(Handle<JSObject> holder) { holder_ = holder; }
   Handle<Map> map() const { return map_; }
   void set_map(Handle<Map> map) { map_ = map; }
   Handle<JSObject> holder() const { return holder_; }
 
  private:
   Handle<Map> map_;
   Handle<JSObject> holder_;
 };
 
@@ skipping 183 matching lines @@
 
   void CompileElementHandlers(MapHandleList* receiver_maps,
                               CodeHandleList* handlers);
 
   static void GenerateStoreSlow(MacroAssembler* masm);
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_IC_HANDLER_COMPILER_H_