Migrate masked_scatter_ CUDA to ATen (#50039)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/49542
Pull Request resolved: https://github.com/pytorch/pytorch/pull/50039
Reviewed By: heitorschueroff
Differential Revision: D26096247
Pulled By: ngimel
fbshipit-source-id: ec1810d3412e0d7ab6b950265a3123519ad886c1
