…/down.

const_manually_drop was stabilized in 1.32 as mentioned in
https://github.com/rust-lang/rust/blob/master/RELEASES.md#version-1320-2019-01-17

…ottmcm

Added next_up and next_down for f32/f64.

This is a pull request implementing the features described at rust-lang/rfcs#3173.

…rop-since, r=kennytm

Fix since attribute for const_manually_drop feature

const_manually_drop was stabilized in 1.32 as mentioned in
https://github.com/rust-lang/rust/blob/master/RELEASES.md#version-1320-2019-01-17

…riplett

Add `io::Error::other`

This PR adds a small utility constructor, `io::Error::other`, a shorthand for `io::Error::new(io::ErrorKind::Other, err)`, something I find myself writing often.

For some concrete stats, a quick search on [grep.app](https://grep.app) shows that more than half of the uses of `io::Error::new` use `ErrorKind::Other`:
```
Error::new\((?:std::)?(?:io::)?ErrorKind:: => 3,898 results
Error::new\((?:std::)?(?:io::)?ErrorKind::Other => 2,186 results
```

update stdarch

2 commits in d219ad6..0716b22
2021-12-9 23:50:37 +0000 to 2021-12-14 16:17:57 +0100
 * Fix a bunch of typos ([Fix a bunch of typos stdarch#1267](rust-lang/stdarch#1267))
 * Stabilize armv8 neon instruction set on aarch64 ([Stabilize armv8 neon instruction set on aarch64 stdarch#1266](rust-lang/stdarch#1266))

The update stabilizes armv8 neon instructions on aarch64. rust-lang#90972

ancillary fix dragonfly build

Pull in libdevstat on FreeBSD

Similar to rust-lang#90495, spotted in rust-lang#91909.

…lacrum

link to pref_align_of tracking issue

If we are not going to remove this intrinsic (rust-lang#90877), I think we should at least have a place to centralize discussion around it, so here we go. Intrinsics don't have their own separate features and usually we instead use the public method for tracking it, but this one does not have such a method... so the tracking issue is just a regular link. (And then we sue it for the const part as well.)