Added complex types to get_all_dtypes and turned on masked_fill for complex (#36335)
Summary:
1. Added complex dtypes to get_all_dtypes to unify testing for complex dtypes with other dtypes so that they don't get out of sync with behavior supported for other dtypes.
2. resolves https://github.com/pytorch/pytorch/issues/36322, https://github.com/pytorch/pytorch/issues/36327
Pull Request resolved: https://github.com/pytorch/pytorch/pull/36335
Differential Revision: D20950587
Pulled By: anjali411
fbshipit-source-id: ba7c372a28f007372b6f15adf7c52d3a09fd4007
