delete TH (#69929)
Summary:
Move TH<C>GenerateByteType includes into torch/csrc (the only place they are used), and we can remove TH folder altogether!
The only thing left in THC are includes left for bc compatibility.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69929
Reviewed By: mruberry
Differential Revision: D33133013
Pulled By: ngimel
fbshipit-source-id: 78c87cf93d2d641631b0f71051ace318bf4ec3c1
