Port silu to structured (#58050)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/58050
Test Plan: Imported from OSS
Reviewed By: agolynski
Differential Revision: D28382790
Pulled By: ezyang
fbshipit-source-id: 5aeedfe39b5f15d14022d1e9edec1b30e98e5076
