Re-work Conv2d
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/24115
Test Plan: Imported from OSS
Reviewed By: eellison
Differential Revision: D16765474
Pulled By: jamesr66a
fbshipit-source-id: 2bb24ad828f5ff325bd978e384c5ec6a0c9610b0
