made functorch not decompose by default (#66945)
Summary:
Basically reverting this: https://github.com/pytorch/pytorch/pull/63616
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66945
Reviewed By: zou3519
Differential Revision: D31802176
Pulled By: Chillee
fbshipit-source-id: b1cabd7af66aef26411801516c87336eaea4fccb
