Auto merge of #149118 - folkertdev:stdarch-sync-2025-11-19, r=tgross35

stdarch subtree update

Subtree update of `stdarch` to rust-lang/stdarch@50134e1.

Created using https://github.com/rust-lang/josh-sync.

The only interesting commit is the final one, which enables the `avx10_target_feature` feature in the standard library, because it is now used in `stdarch`.

r? `@sayantn` (or whoever, this is just a straightforward sync)

Author: bors