Access root->simple_rte_array instead of Query->rtable for 2 more cases.

When I am understanding the relationship between Query->rtable and
root->simple_rte_array, I'd like to assume that Query->rtable should be never used
when root->simple_rte_array is ready. I mainly checked two places, make_one_rel and
create_plan with the below hacks.

{
  List *l = root->parse->rtable;
  root->parse->rtable = NIL;
  make_one_rel..  or create_plan_recurse..
  root->parse->rtable = l;
}


Then I found adjust_appendrel_attrs_mutator and infer_arbiter_indexes still