Fuse unsqueeze, cat, sum for inline_cvr (#68289)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/68289
Fuse op unsqueese+cat+sum to add op
Reviewed By: jfix71
Differential Revision: D31769197
fbshipit-source-id: 184b3c8217f2ad9fab9ac8d3c91cd33cf7e7de30
