Promote missing ops for delegated models (#66052)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66052
`aten::__getitem__.Dict_str` and `prim::unchecked_cast` are used in delegate API.
ghstack-source-id: 139860350
Test Plan: CI
Reviewed By: pavithranrao
Differential Revision: D31364720
fbshipit-source-id: dfca5e3ded4cdd3329c9b9d80a13f0fb1f5f2a51
