General convolution_backward function (#69044)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/69044
Test Plan: Imported from OSS
Reviewed By: zou3519, albanD, H-Huang
Differential Revision: D32708818
Pulled By: jbschlosser
fbshipit-source-id: e563baa3197811d8d51553fc83718ace2f8d1b7a
