Make index translate/inobject only rely on the map.

src/ic.cc

Index: src/ic.cc
diff --git a/src/ic.cc b/src/ic.cc
index 9b304057ade037d471539297de6c3c4762d9bc73..5f024b0b5765aad1bcc79628fea04ca13f5e73ca 100644
--- a/src/ic.cc
+++ b/src/ic.cc
@@ -1201,8 +1201,8 @@ Handle<Code> LoadIC::CompileHandler(LookupResult* lookup,
     case FIELD: {
       PropertyIndex field = lookup->GetFieldIndex();
       if (object.is_identical_to(holder)) {
-        return SimpleFieldLoad(field.translate(holder),
-                               field.is_inobject(holder),
+        return SimpleFieldLoad(field.translate(holder->map()),
+                               field.is_inobject(holder->map()),
                                lookup->representation());
       }
       return compiler.CompileLoadField(