remove unnecessary ATen/core/Macros.h
Pull Request resolved: https://github.com/pytorch/pytorch/pull/76376
This is only used in a few places and only aliases the c10 macros
header.
Differential Revision: [D35904936](https://our.internmc.facebook.com/intern/diff/D35904936/)
Approved by: https://github.com/dreiss, https://github.com/malfet
Author
Michael Andreas Dagitses
