Update stdarch to add some AVX512 intrinsics

[Daniel-B-Smith]

The bulk of these changes are from this PR which adds some new AVX 512f intrinsics: rust-lang/stdarch#856

There is a backwards incompatible change for the unstabilized type __mmask16 to be consistent with Clang and easier to use: rust-lang/stdarch#859

It also includes this bugfix: rust-lang/stdarch#857

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @joshtriplett (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

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[rust-highfive]

⚠️Warning⚠️

• These commits modify submodules.

[joshtriplett]

r? @Amanieu

[Amanieu]

@bors r+

The CI failures are unrelated.

[bors]

📌 Commit 93350a0 has been approved by Amanieu

[Amanieu]

Closing in favor of #72749 which includes additional AArch64 TME intrinsics.