Add min function to cuda math compat (#34723)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/34723
Add min function to cuda math compat
Test Plan: unittest
Reviewed By: houseroad
Differential Revision: D20444517
fbshipit-source-id: 1a93343cc57249ef1101eeb7ef373266f6a2873a
