Add CI config to test USE_PER_OPERATOR_HEADERS=0 (#69907)
Summary:
The CMake build defaults to `USE_PER_OPERATOR_HEADERS = 1` which
generates extra headers in the `ATen/ops` folder that don't exist
otherwise. In particular, fb-internal builds using buck don't support
these headers and so all includes must be guarded with
`#ifdef AT_PER_OPERATOR_HEADERS`.
This adds a CI run which builds with `USE_PER_OPERATOR_HEADERS = 0` so
open source contributions don't have to wait for their PR to be
imported to find out it doesn't work in fb-internal. This flag
shouldn't effect runtime behavior though, so I don't run any tests.
cc seemethere malfet pytorch/pytorch-dev-infra
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69907
Reviewed By: malfet, atalman
Differential Revision: D33411864
Pulled By: seemethere
fbshipit-source-id: 18b34d7a83dc81cf8a6c396ba8369e1789f936e9
