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

These are currently documented at
https://rustc-dev-guide.rust-lang.org/rustdoc-internals.html#hot-potato
but can easily go out of date. We'd like to document them in place and
link to
https://doc.rust-lang.org/nightly/nightly-rustc/rustdoc/passes/index.html

…rochenkov

Warn when a `#[test]`-like built-in attribute macro is present multiple times.

Fixes rust-lang#90979.

…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

…wiser

Remove `in_band_lifetimes` from `rustc_borrowck`

See rust-lang#91867 for more information.

…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
```

Pull in libdevstat on FreeBSD

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

Add module documentation for rustdoc passes

These are currently documented at https://rustc-dev-guide.rust-lang.org/rustdoc-internals.html#hot-potato but can easily go out of date. We'd like to document them in place and link to https://doc.rust-lang.org/nightly/nightly-rustc/rustdoc/passes/index.html

[Discussed on Zulip](https://rust-lang.zulipchat.com/#narrow/stream/266220-rustdoc/topic/moving.20pass.20docs/near/265058351).

r? `@camelid`

Fix default_method_body_is_const when used across crates

r? `@oli-obk`

unblocks rust-lang#91439.