Correctly resolve dispatch keys for PyOperator (#96306)
Previously, we never actually used resolve_key, which meant that
you had to register CPU/CUDA/etc all manually; none of the alias
keys worked. Now they work.
Signed-off-by: Edward Z. Yang <ezyang@meta.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/96306
Approved by: https://github.com/Skylion007, https://github.com/zou3519
