Make nonzero non differentiable as it supposed to be (#26980)
Summary:
Fixes: https://github.com/pytorch/pytorch/issues/26038
Somewhere between v1.1 and master `nonzero` become `abstract` and was marked as differentiable (by mistake) we need to but them into TH section of `tools/autograd/derivatives.yaml ` to fix it.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/26980
Differential Revision: D17632276
Pulled By: VitalyFedyunin
fbshipit-source-id: d6cabcc53348af6148cea5a1bd1af2ef12547373
