Port replication_pad1d_backward to structured (#55537)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/55537
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Reviewed By: albanD
Differential Revision: D27641208
Pulled By: ezyang
fbshipit-source-id: 56303b103e3ebc651bb64d11a9b19647f9affe53
