add ZeroTensor specialization to div.Tensor (#71862)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/70027. Fixes https://github.com/pytorch/pytorch/issues/69925. Reverts https://github.com/pytorch/pytorch/issues/70061. Completes a task from https://github.com/pytorch/pytorch/issues/69687.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71862
Reviewed By: george-qi
Differential Revision: D33824078
Pulled By: anjali411
fbshipit-source-id: 114754161077281f9804476288ed796d344ee54b
(cherry picked from commit 55ce1d5c02b5869497d07e916c46b6f50287542c)
