Back out "cherry-picking autodiff support for gather/index_select (#93333)" (#95565)
Summary: A bisect blamed #93333 for GPU memory leakage. This diff backs it out.
Test Plan: Monitor max GPU memory usage to see if there's a leak.
Reviewed By: hyuen, yinbinm
Differential Revision: D43511893
Pull Request resolved: https://github.com/pytorch/pytorch/pull/95565
Approved by: https://github.com/ngimel
