[RFC] [Modular] Include less headers in vararg_functions.cpp (#65672)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65672
`ATen/ATen.h` has a list of all headers but vararg_functions.cpp only uses two of them. Change to include less for min_runtime.
ghstack-source-id: 139389772
Test Plan: CI
Reviewed By: larryliu0820
Differential Revision: D31198293
fbshipit-source-id: 9794a2696a1b124be7fced2836c633ae899aa5c8
