Remove GPU dependency from ProfileObserver (#17592)
Summary:
Remove GPU dependency and register ProfileObserver.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17592
Reviewed By: ezyang
Differential Revision: D14265801
Pulled By: mdschatz
fbshipit-source-id: f98c0c32653c64a8b087c58ece4f864dfbe1d4b8
