Move representation into HObjectAccess and remove from HLoadNamedField and HStoreNamedField.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 3a8d242b8c14d5bcceae6e3207ee15526c228f8f..3b5b6343c1ff470c5090fecbf6d3777839d2b1ba 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -1117,24 +1117,12 @@ class HGraphBuilder {
   HLoadNamedField* AddLoad(
       HValue *object,
       HObjectAccess access,
-      HValue *typecheck = NULL,
-      Representation representation = Representation::Tagged());
-
-  HLoadNamedField* BuildLoadNamedField(
-      HValue* object,
-      HObjectAccess access,
-      Representation representation);
-
-  HStoreNamedField* AddStore(
-      HValue *object,
-      HObjectAccess access,
-      HValue *val,
-      Representation representation = Representation::Tagged());
+      HValue *typecheck = NULL);
 
+  HLoadNamedField* BuildLoadNamedField(HValue* object, HObjectAccess access);
+  HStoreNamedField* AddStore(HValue *object, HObjectAccess access, HValue *val);
   HStoreNamedField* AddStoreMapConstant(HValue *object, Handle<Map>);
-
   HLoadNamedField* AddLoadElements(HValue *object, HValue *typecheck = NULL);
-
   HLoadNamedField* AddLoadFixedArrayLength(HValue *object);
 
   class IfBuilder {