Migrate cosh to structured kernel (#55563)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/55563
Test Plan: Imported from OSS
Reviewed By: pbelevich
Differential Revision: D27653767
Pulled By: SplitInfinity
fbshipit-source-id: 11cd631679b9b5a88443a714a56f4178f5bf41b0
