Revert D29701479: [pytorch][PR] Remove `_broadcast_object()` from `ZeroRedundancyOptimizer`
Test Plan: revert-hammer
Differential Revision:
D29701479 (https://github.com/pytorch/pytorch/commit/9b5d9b404927d4438d449a36749fbe62273fdde4)
Original commit changeset: c8d5f9057b32
fbshipit-source-id: 35ab1f399513fb9d1c4e73b1fa906e559d2a6994
