Avoid one repeated property lookup when computing store ICs.

src/stub-cache.h

 // Copyright 2012 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_STUB_CACHE_H_
 #define V8_STUB_CACHE_H_
 
 #include "src/allocation.h"
 #include "src/arguments.h"
 #include "src/code-stubs.h"
@@ skipping 540 matching lines @@
  public:
   explicit NamedStoreHandlerCompiler(Isolate* isolate, Handle<HeapType> type,
                                      Handle<JSObject> holder)
       : PropertyHandlerCompiler(isolate, Code::STORE_IC, type, holder,
                                 kCacheOnReceiver) {}
 
   virtual ~NamedStoreHandlerCompiler() {}
 
   Handle<Code> CompileStoreTransition(Handle<Map> transition,
                                       Handle<Name> name);
-  Handle<Code> CompileStoreField(LookupResult* lookup, Handle<Name> name);
+  Handle<Code> CompileStoreField(LookupIterator* lookup, Handle<Name> name);
   Handle<Code> CompileStoreCallback(Handle<JSObject> object, Handle<Name> name,
                                     Handle<ExecutableAccessorInfo> callback);
   Handle<Code> CompileStoreCallback(Handle<JSObject> object, Handle<Name> name,
                                     const CallOptimization& call_optimization);
   Handle<Code> CompileStoreViaSetter(Handle<JSObject> object, Handle<Name> name,
                                      Handle<JSFunction> setter);
   Handle<Code> CompileStoreInterceptor(Handle<Name> name);
 
   static void GenerateStoreViaSetter(MacroAssembler* masm,
                                      Handle<HeapType> type, Register receiver,
@@ skipping 11 matching lines @@
   virtual void FrontendFooter(Handle<Name> name, Label* miss);
   void GenerateRestoreName(Label* label, Handle<Name> name);
 
  private:
   void GenerateStoreTransition(Handle<Map> transition, Handle<Name> name,
                                Register receiver_reg, Register name_reg,
                                Register value_reg, Register scratch1,
                                Register scratch2, Register scratch3,
                                Label* miss_label, Label* slow);
 
-  void GenerateStoreField(LookupResult* lookup, Register value_reg,
+  void GenerateStoreField(LookupIterator* lookup, Register value_reg,
                           Label* miss_label);
 
   static Builtins::Name SlowBuiltin(Code::Kind kind) {
     switch (kind) {
       case Code::STORE_IC: return Builtins::kStoreIC_Slow;
       case Code::KEYED_STORE_IC: return Builtins::kKeyedStoreIC_Slow;
       default: UNREACHABLE();
     }
     return Builtins::kStoreIC_Slow;
   }
@@ skipping 70 matching lines @@
   Handle<JSFunction> constant_function_;
   bool is_simple_api_call_;
   Handle<FunctionTemplateInfo> expected_receiver_type_;
   Handle<CallHandlerInfo> api_call_info_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_STUB_CACHE_H_