Kill non-forward, non-backward functions generated from nn.yaml (#15127)
Summary:
Updating binding to legacy functions.
Remove unused declarations.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15127
Differential Revision: D13433405
Pulled By: VitalyFedyunin
fbshipit-source-id: 58544d38affd20818742338c9eb789d9d14ccbaa
