In https://reviews.llvm.org/D102093 lots of things stopped taking the
DebugLogging boolean parameter. Mercifully we appear to always set
DebugPassManager to false, so I don't think we're losing anything by not
passing this parameter.

The makes the code for handling "auto-hide" settings more consistent.

Add method-toggle to <details> for methods

The makes the code for handling "auto-hide" settings more consistent.

Demo at https://hoffman-andrews.com/rust/hoist-classes/std/string/struct.String.html

Fixes rust-lang#84829

Move `std::memchr` to `sys_common`

`std::memchr` is a thin abstraction over the different `memchr` implementations in `sys`, along with documentation and tests. The module is only used internally by `std`, nothing is exported externally. Code like this is exactly what the `sys_common` module is for, so this PR moves it there.

…ou-se

Expose `Concurrent` (private type in public i'face)

rust-lang#53410 introduced experimental support for custom test frameworks.

Such frameworks may wish to build upon `library/test` by calling into its publicly exposed API (which I entirely understand is wholly unstable).  However, any that wish to call `test::run_test` cannot currently do so because `test::options::Concurrent` (the type of its `concurrent` parameter) is not publicly exposed.

…=jonas-schievink

⬆️ rust-analyzer

…gisa

PassWrapper: update for LLVM change D102093

In https://reviews.llvm.org/D102093 lots of things stopped taking the
DebugLogging boolean parameter. Mercifully we appear to always set
DebugPassManager to false, so I don't think we're losing anything by not
passing this parameter.

…_type, r=davidtwco

Add diagnostic item to `CStr`

Required for clippy issue: rust-lang/rust-clippy#7145

Fix invalid CSS rules for a:hover

When hovering some links:

![Screenshot from 2021-05-19 15-00-31](https://user-images.githubusercontent.com/3050060/118823585-5f2a4b80-b8b9-11eb-8043-bb7759a178c7.png)
![Screenshot from 2021-05-19 15-00-29](https://user-images.githubusercontent.com/3050060/118823566-5b96c480-b8b9-11eb-8c4e-08e490752fbf.png)

It is a side-effect from rust-lang#84462.

r? `@jsha`