Add NoOpDeviceGuardImpl (#53142)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/53142
It turns out to make Meta a device I need to substantively reuse
the CPUGuardImpl implementation. It's pretty parametrizable so
just move this over to DeviceGuardImplInterface templated over
the DeviceType.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Reviewed By: anjali411, samestep
Differential Revision: D26763553
Pulled By: ezyang
fbshipit-source-id: 464fb3e3a72ba7c55a12adffe01c18171ce3e857
