Don't suppress exceptions from backends
Taken from voz's https://github.com/pytorch/pytorch/pull/89392
Signed-off-by: Edward Z. Yang <ezyangfb.com>
ghstack-source-id: 698ac2222b43e05e5d06ab0461dd9f9f29666f0f
Pull Request resolved: https://github.com/pytorch/pytorch/pull/89656
