Align AT_FORALL macros with AT_DISPATCH macros.
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/23339
Test Plan: Imported from OSS
Differential Revision: D16467983
Pulled By: gchanan
fbshipit-source-id: 84a29a03d3ec9c6416cad254a9ff1005fdc6324f
