[DDP] log gradient ready order and bucket indices (#62751)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/62751
This will help us determine whether gradient ready order and bucket
indices are aligned amongst all the ranks. This should always be true for rank
0 as we determine rebuilt bucket order by the gradient ready order on rank 0,
but would be interested to see this on different workloads for other ranks
ghstack-source-id: 135104369
Test Plan: CI
Reviewed By: SciPioneer, wanchaol
Differential Revision: D30111833
fbshipit-source-id: a0ab38413a45022d953da76384800bee53cbcf9f
