[PyTorch] Reduce code size of register_prim_ops.cpp (#61494)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61494
Creating a constexpr array and then looping over it is much cheaper than emitting a function call per item.
ghstack-source-id: 136639302
Test Plan:
fitsships
Buildsizebot some mobile apps to check size impact.
Reviewed By: dhruvbird, iseeyuan
Differential Revision: D29646977
fbshipit-source-id: 6144999f6acfc4e5dcd659845859702051344d88
