I exercized a code path that broke, it's not like unrelated code broke, it was code I was actually using in a commit in the upstream library that changed not mu

I exercized a code path that broke, it's not like unrelated code broke, it was code I was actually using in a commit in the upstream library that changed not much for the end user and then was broken by the compiler fairly soon after. The issue is related to AVX detection in the CPU, which has the reasonable failure path of "don't build it with AVX".