[aarch64] Fix _mm_pause() on aarch64 (#84505)
Summary:
It's possible if you're using simde that _mm_pause is already
defined, so intsead use the asm for yield
Test Plan: CI
Differential Revision: D39225258
Pull Request resolved: https://github.com/pytorch/pytorch/pull/84505
Approved by: https://github.com/ajtulloch
