[DDP] Track models with sync bn (#66680)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66680
Closes https://github.com/pytorch/pytorch/issues/66215. Tracks models
with sync BN so we can find workflows that use them and target for perf
optimization.
ghstack-source-id: 140875182
Test Plan: CI
Reviewed By: pritamdamania87
Differential Revision: D31679477
fbshipit-source-id: 0e68cd1a7aabbc5b26227895c53d33b8e98bfb8e
