Tracking Issue for `sha512_sm_x86`

[sayantn]

This tracks the integration of Intel's SHA512, SM3 and SM4 instruction sets in Rust

The feature gate for the issue is #![feature(sha512_sm_x86)].

Steps

• Add the feature to rustc
• Add the target-features
• Add the intrinsics to stdarch
• Stabilization PR

Implementation History

• Added SHA512, SM3, SM4 target-features and sha512_sm_x86 feature gate #126704
• Add Runtime detection for SHA512, SM3 and SM4 stdarch#1592
• Implement SHA512, SM3 and SM4 intrinsics stdarch#1790