No functional changes intended.

Adapts PassWrapper for two recent LLVM API changes:
* llvm/llvm-project@e7bac3b
* llvm/llvm-project@93600eb
* llvm/llvm-project@5e38b2a

This was added in 51f26ac to help with the
display of an `<h3>` tag that has a `<span class='in-band'>` inside.

The way implementation lists were rendered was changed in
34bd2b8 to have `<code class='in-band'>`,
making this CSS unused.

Then it was turned into a `<div>` in 9077d54
without issue.

Finally, the header itself acquired the `in-band` class in
76a3b60.

This was added in 9077d54 to override the
style on `<div>` tags that were acting as headers. These `<div>` tags were
replaced with `<section>` tags in 32f6260,
but this CSS was probably already redundant even then (the headers had
already been replaced with real `<h3>` and `<h4>` tags in
76a3b60).

This CSS was added in 5e01ba3, and served to
override CSS right above it that set a 5px padding for several kinds of
buttons in the same toolbar.

The CSS that it overrode is still there, but now it only applies to
`#settings-menu > a`, so there's nothing to override.

Fix hermit warnings

This fixes two `unused_imprt` and one `dead_code` warning for hermit.

…li-obk

Introduce lowering_arena to avoid creating AST nodes on the fly

`@oli-obk` requested this and other changes as a way of simplifying rust-lang#101345. This is just going to make the diff of rust-lang#101345 smaller.

r? `@oli-obk` `@cjgillot`

llvm-wrapper: adapt for LLVM API changes

No functional changes intended.

Adapts PassWrapper for a few recent LLVM API changes:
* llvm/llvm-project@e7bac3b
* llvm/llvm-project@93600eb
* llvm/llvm-project@5e38b2a

Note that `ModuleMemorySanitizerPass` was renamed back to its pre-14 name, `MemorySanitizerPass`, hence the funky `#if LLVM_VERSION_GE(14, 0) && LLVM_VERSION_LT(16, 0)` guard.

Found via our experimental rust + llvm at HEAD bot: https://buildkite.com/llvm-project/rust-llvm-integrate-prototype/builds/13290#018315e6-24e1-44c8-b56d-9aad9be11c29

…list-h3-span-in-band, r=Dylan-DPC

rustdoc: remove unused CSS `#implementations-list > h3 > span.in-band`

This was added in 51f26ac to help with the display of an `<h3>` tag that has a `<span class='in-band'>` inside.

The way implementation lists were rendered was changed in 34bd2b8 to have `<code class='in-band'>`, making this CSS unused.

Then it was turned into a `<div>` in 9077d54 without issue.

Finally, the header itself acquired the `in-band` class in 76a3b60.

…-div, r=GuillaumeGomez

rustdoc: remove unused CSS `div.impl-items > div`

This was added in 9077d54 to override the style on `<div>` tags that were acting as headers. These `<div>` tags were replaced with `<section>` tags in 32f6260, but this CSS was probably already redundant even then (the headers had already been replaced with real `<h3>` and `<h4>` tags in 76a3b60).

… r=GuillaumeGomez

rustdoc: remove no-op CSS `#settings-menu { padding: 0 }`

This CSS was added in 5e01ba3, and served to override CSS right above it that set a 5px padding for several kinds of buttons in the same toolbar:

https://github.com/rust-lang/rust/blob/5e01ba36c9f1037c4cf3e7421413fc6c41f85d05/src/librustdoc/html/static/css/rustdoc.css#L1400-L1409

The CSS that it overrode is still there, but now it only applies to `#settings-menu > a`, so there's nothing to override.

https://github.com/rust-lang/rust/blob/24d69920201563f0ee7b530f1cda0f171b205cc2/src/librustdoc/html/static/css/rustdoc.css#L1445-L1454

Make `Debug` impl for `Term` useful

because `Term { ptr: 78942378998734298342, maker: PhantomData, }` does not excel at communicating the necessary information