clang-format by line (#21531)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21531
ghimport-source-id: 711867e19cc3948a5e2a6aa8c4f2cd631abb04d2
Reviewed By: zdevito
Differential Revision: D15719260
Pulled By: suo
fbshipit-source-id: e88c5d3e14e6ecc956ce30ab0246ed606f4b0a38
