pytorch

6e5f736d - [15/N] Add allreduce_coalesced custom op with CPU/CUDA implementations (#88846)

[15/N] Add allreduce_coalesced custom op with CPU/CUDA implementations (#88846) Differential Revision: [D41227740](https://our.internmc.facebook.com/intern/diff/D41227740) Pull Request resolved: https://github.com/pytorch/pytorch/pull/88846 Approved by: https://github.com/kwen2501