Auto merge of #161022 - jhpratt:rollup-jXEC06F, r=jhpratt

Rollup of 5 pull requests

Successful merges:

 - rust-lang/rust#160998 (rustfmt: restrict `cfg_select!` formatting to the `nightly` release channel)
 - rust-lang/rust#154150 (core: Improve the documentation for funnel shifts)
 - rust-lang/rust#161009 (Fix asimd/neon detection on aarch64-darwin)
 - rust-lang/rust#160950 (dogfood `#[diagnostic::unknown]` in the compiler)
 - rust-lang/rust#161010 (Add regression test for const fn returning Vec of boxed dyn Any)