Added degrees, radians, ldexp (#21131)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21131
ghimport-source-id: 62b9cb71a17f9c9a7999a6e33c2d8b840ce097ff
Differential Revision: D15563184
Pulled By: Chillee
fbshipit-source-id: e2c47fb9f9c0fe9f039cfd001c5e6d5b455e034c
