pytorch

fb0e27d3 - Add mechanism for functorch to error out on autograd.Function (#71866)

Add mechanism for functorch to error out on autograd.Function (#71866) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/71866 See title. There is a minimal perf regression for the non-functorch case (a TLS access and a null check). Test Plan: Imported from OSS Reviewed By: soulitzer Differential Revision: D33825279 Pulled By: zou3519 fbshipit-source-id: afa2ad5a672cc9225d2bb6b46ee7f3f1513c1e02 (cherry picked from commit 17ae1d3e9dcf57193a2d90f755e18994671c9f13)