pytorch

0650a616 - [c10d] switch ProcessGroup::Work to be managed by intrusive_ptr (#44046)

[c10d] switch ProcessGroup::Work to be managed by intrusive_ptr (#44046) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/44046 Test Plan: Imported from OSS Reviewed By: gmagogsfm Differential Revision: D23632280 Pulled By: wanchaol fbshipit-source-id: 0a4642a8ffabdd26c52c1baabfa30c0f446c3c85