Avoid one repeated property lookup when computing load ICs.

src/lookup.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_LOOKUP_H_
 #define V8_LOOKUP_H_
 
 #include "src/factory.h"
 #include "src/isolate.h"
 #include "src/objects.h"
@@ skipping 113 matching lines @@
                                 PropertyAttributes attributes,
                                 Object::StoreFromKeyed store_mode);
   PropertyKind property_kind() const {
     ASSERT(has_property_);
     return property_kind_;
   }
   PropertyDetails property_details() const {
     ASSERT(has_property_);
     return property_details_;
   }
+  bool has_fast_properties() const { return !holder_map_->is_dictionary_map(); }
   int descriptor_number() const {
     ASSERT(has_property_);
     ASSERT_EQ(DESCRIPTOR, property_encoding_);
     return number_;
   }
+  int dictionary_entry() const {
+    ASSERT(has_property_);
+    ASSERT_EQ(DICTIONARY, property_encoding_);
+    return number_;
+  }
+  bool IsConfigurable() const { return !property_details().IsDontDelete(); }
+  Representation representation() const {
+    return property_details().representation();
+  }
+  FieldIndex GetFieldIndex() const {
+    ASSERT_EQ(PROPERTY, state_);
+    return FieldIndex::ForLookupIterator(this);
+  }
   Handle<Object> GetAccessors() const;
   Handle<Object> GetDataValue() const;
   void WriteDataValue(Handle<Object> value);
 
   void InternalizeName();
 
  private:
   Handle<Map> GetReceiverMap() const;
 
   MUST_USE_RESULT bool NextHolder();
@@ skipping 34 matching lines @@
   MaybeHandle<Object> maybe_receiver_;
   MaybeHandle<JSReceiver> maybe_holder_;
 
   int number_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LOOKUP_H_