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* re-stabilize the AVX-512 features that were stabilized in Rust 1.27.0 https://github.com/rust-lang/stdarch/pull/739 added per-feature stabilization of runtime CPU feature detection. In so doing, it de-stabilized some detection features that had been stable since Rust 1.27.0, breaking some published crates (on nightly). This commit re-stabilizes the subset of AVX-512 detection features that were included in 1.27.0 (that is, the pre-Ice-Lake subset). Other instruction sets (MMX in particular) remain de-stabilized, pending a decision about whether should ever stabilize them. See https://github.com/rust-lang/rust/issues/68905. * add a comment explaining feature detection stability * adjust stabilizations to match most recent proposal https://github.com/rust-lang/rust/issues/68905#issuecomment-595376319