Remove un-used function in autograd engine (#72687)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/72687
Not sure who would use that. It is not used in the code base as far as I can see. And I don't know of anyone working with the engine directly out of tree. So tentatively removing it.
Test Plan: Imported from OSS
Reviewed By: soulitzer
Differential Revision: D34180244
Pulled By: albanD
fbshipit-source-id: 678ba1c4a1cbd9a0458d33be97664d1e3d1bd86b
(cherry picked from commit 3968ca3a380eca41264664f197d12c8da2c27002)
