[c10d] Enforce order of waited ranks in monitored barrier. (#55009)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/55009
Changes monitoredBarrier so that we await acknowledgemenet from ranks
in a consistent order (from least to greatest). This will reduce confusion
around the order the ranks are awaited. We are still planning to add support
for awaiting all ranks in follow up changes.
ghstack-source-id: 125699838
Test Plan: CI
Reviewed By: SciPioneer
Differential Revision: D27405417
fbshipit-source-id: b9a3e72742cbffdd9bf890ab2c94103b768a7b71
