Add operator div (#68528)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/68528
Add operator converter div, torch.floor_div is announce to be deprecated by pytorch, consider remove after full deprecation done by pytorch.
Reviewed By: 842974287
Differential Revision: D32497573
fbshipit-source-id: d06c864077f745c295c33fb25639b7116f85ca20
