Further reduce LookupResult usage

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 896efcf65f68c1d75ec5a19c9c6823d1541daf69..87860be6738c0c4d14b895243f95644938275b5a 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -4642,24 +4642,9 @@ HObjectAccess HObjectAccess::ForBackingStoreOffset(int offset,
 }
 
 
-HObjectAccess HObjectAccess::ForField(Handle<Map> map,
-                                      LookupResult* lookup,
+HObjectAccess HObjectAccess::ForField(Handle<Map> map, int index,
+                                      Representation representation,
                                       Handle<String> name) {
-  DCHECK(lookup->IsField() || lookup->IsTransitionToField());
-  int index;
-  Representation representation;
-  if (lookup->IsField()) {
-    index = lookup->GetLocalFieldIndexFromMap(*map);
-    representation = lookup->representation();
-  } else {
-    Map* transition = lookup->GetTransitionTarget();
-    int descriptor = transition->LastAdded();
-    index = transition->instance_descriptors()->GetFieldIndex(descriptor) -
-        map->inobject_properties();
-    PropertyDetails details =
-        transition->instance_descriptors()->GetDetails(descriptor);
-    representation = details.representation();
-  }
   if (index < 0) {
     // Negative property indices are in-object properties, indexed
     // from the end of the fixed part of the object.