Improved coverage for unboxed->boxed kernel wrappers (#38999)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/38999
Adds boxing for inplace and outplace kernels, itemizes
remaining unsupported cases, and fails compilation when
new unsupported types are introduced in op signatures.
Test Plan: Imported from OSS
Differential Revision: D21718547
Pulled By: bhosmer
fbshipit-source-id: 03295128b21d1843e86789fb474f38411b26a8b6
