pytorch

de7ac60c - Add out= variants for cuda.comm.broadcast/gather/scatter (#39681)

Add out= variants for cuda.comm.broadcast/gather/scatter (#39681) Summary: Partially fixes https://github.com/pytorch/pytorch/issues/38911 Pull Request resolved: https://github.com/pytorch/pytorch/pull/39681 Differential Revision: D22161342 Pulled By: mrshenli fbshipit-source-id: 60295077159b02087823e93bb6ebac9d70adea0a