DeviceScope support for CUDA and testing (#15357)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15357
Supporting device option in FQ bn folding for ITER related ops
Reviewed By: wat3rBro
Differential Revision: D13370259
fbshipit-source-id: 4324c2716dfa69ddedc661ae2b1ad34c2f6fc4b6
