Add CUDA 11.1 CI (#46616)
Summary:
libtorch XImportant now runs on CUDA 11.1,
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46616
Reviewed By: gchanan
Differential Revision: D24452660
Pulled By: malfet
fbshipit-source-id: 3480a2533214f2d986444ff912f619503a75940d
