add new model hf_clip to DENSE_MODELS (#1943)
Summary:
Fixes https://github.com/pytorch/benchmark/issues/1942
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1943
Reviewed By: xuzhao9
Differential Revision: D49733689
Pulled By: janeyx99
fbshipit-source-id: 241b1674b07cfdda69f382a0e8420c8440d4df12
