Stabilize `sha512`, `sm3` and `sm4` for x86#140767

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sayantn:stabilize-sha512

Commits on May 31, 2025

Stabilize `sha512_sm_x86`, and the `sha512`, `sm3` and `sm4` target features
sayantn
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Update stdarch to stabilize the intrinsics and runtime detection for `sha512_sm_x86`
sayantn
committed