PixelShuffle module and functional (#28140)
Summary:
Added `PixelShuffle` module and functional https://github.com/pytorch/pytorch/issues/25883
Pull Request resolved: https://github.com/pytorch/pytorch/pull/28140
Differential Revision: D18008474
Pulled By: yf225
fbshipit-source-id: f482495bb56998701c79a61ef065a121bf5a5154
