Fix regression in torch.qr (#23591)
Summary:
Changelog:
- Use narrow instead of narrow_copy while returning
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23591
Test Plan:
- All tests should pass to ensure that the change is correct
Fixes https://github.com/pytorch/pytorch/issues/23580
Differential Revision: D16581174
Pulled By: ezyang
fbshipit-source-id: 1b6bf7d338ddd138ea4c6aa6901834dd202ec79c
