pytorch

aa5d35e1 - [17/n] [torch/elastic] Introduce _DistributedRendezvousOpExecutor (#57145)

[17/n] [torch/elastic] Introduce _DistributedRendezvousOpExecutor (#57145) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/57145 This PR introduces the `_DistributedRendezvousOpExecutor` type that implements the `_RendezvousOpExecutor` interface for rendezvous shared via a `_RendezvousStateHolder`. ghstack-source-id: 127684945 Test Plan: Run the existing and new unit tests. Reviewed By: tierex Differential Revision: D28059417 fbshipit-source-id: 7ef72ea16b54eaaa11a6ece7459d385d49692a84