Code style cleanup (#15854)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15854
- Remove unnecessary `inline` keyword
- Add a TODO stating the intention for Blob::ShareExternal()
Reviewed By: dzhulgakov
Differential Revision: D13605258
fbshipit-source-id: c0bc85c74c4ca4b3811d42ac7f866182e159d840
