Rollup merge of #72749 - vertexclique:vcq/update-stdarch, r=Amanieu
Rollup merge of #72749 - vertexclique:vcq/update-stdarch, r=Amanieu

Update stdarch submodule to latest head

Includes avx512 work & aarch64 tme.

graydon/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust