Add minimal skeleton for _C type stubs, delete torch.autograd stub (#38080)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/38080
Originally, my plan was to just delete the torch.autograd stub, but
this triggered a bunch of downstream errors relating to non-existent
to _C modules, and so instead of ignoring those files, I decided to
add a minimal _C type stubs, where it was easy (cases which were
codegened I ignored).
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Differential Revision: D21487841
Pulled By: ezyang
fbshipit-source-id: cfcc467ff1c146d242cb9ff33a46ba26b33b8213
