Introduce FieldIndex to unify and abstract property/field offset

src/ic.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_IC_H_
 #define V8_IC_H_
 
 #include "src/macro-assembler.h"
 
 namespace v8 {
@@ skipping 463 matching lines @@
 
  private:
   // Stub accessors.
   static Handle<Code> pre_monomorphic_stub(Isolate* isolate,
                                            ExtraICState exstra_state);
 
   virtual Handle<Code> pre_monomorphic_stub() {
     return pre_monomorphic_stub(isolate(), extra_ic_state());
   }
 
-  Handle<Code> SimpleFieldLoad(int offset,
-                               bool inobject = true,
-                               Representation representation =
-                                    Representation::Tagged());
+  Handle<Code> SimpleFieldLoad(FieldIndex index);
 
   static void Clear(Isolate* isolate,
                     Address address,
                     Code* target,
                     ConstantPoolArray* constant_pool);
 
   friend class IC;
 };
 
 
@@ skipping 523 matching lines @@
 DECLARE_RUNTIME_FUNCTION(ElementsTransitionAndStoreIC_Miss);
 DECLARE_RUNTIME_FUNCTION(BinaryOpIC_Miss);
 DECLARE_RUNTIME_FUNCTION(BinaryOpIC_MissWithAllocationSite);
 DECLARE_RUNTIME_FUNCTION(CompareNilIC_Miss);
 DECLARE_RUNTIME_FUNCTION(ToBooleanIC_Miss);
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_IC_H_