[c10d] Log when store based barrier succeeds (#57711)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57711
Seeing some hangs/issues around store based barrier internally, would
be good to have this log to indicate whether store based barrier has completed
successfully or not for a particular rank to debug further.
ghstack-source-id: 128605600
Test Plan: CI
Reviewed By: SciPioneer
Differential Revision: D28249087
fbshipit-source-id: 644e5780519017ae780c3bc78bbe5def322db3f8
