…tor appearance (padding)

to look identical on Firefox. New versions of Firefox appear to have changed behavior to agree with Chrome.

… r=fmease,GuillaumeGomez

rustdoc: fix position of `default` in method rendering

With the following code:
```rs
#![feature(specialization)]

pub trait A {
    unsafe fn a();
}

impl A for () {
    default unsafe fn a() {}
}
```
rustdoc would render the `impl` of `a` as
```rs
unsafe default fn a()
```
which is inconsistent with the actual position of `default`.
This PR fixes this issue.

…wesleywiser

Permit pre-evaluated constants in simd_shuffle

fixes rust-lang#113500

Avoid another gha group nesting

fixes rust-lang#113798 (`x test error_index_generator` did not work locally anymore)

r? ``@jyn514``

Add Foreign, Never, FnDef, Closure and Generator tys to SMIR

r? ``@oli-obk``

…ng-self-ty, r=compiler-errors

new solver: don't consider blanket impls multiple times

only consider candidates which rely on the self type in `assemble_candidates_after_normalizing_self_ty`.

r? ``@compiler-errors``

…ctor-padding, r=GuillaumeGomez

Remove outdated Firefox-specific CSS for search's crate selector appearance

Remove adjustments that used to be necessary for search's crate selector appearance (padding) to look identical on Firefox. New versions of Firefox appear to have changed behavior to agree with Chrome.

As briefly discussed in rust-lang#98855 (comment)

r? ``@GuillaumeGomez``

…e, r=davidtwco

Don't translate compiler-internal bug messages

These are not very useful to be translated, as

* translators would get really weird and bad english versions to start out from,
* compiler devs have to do some work for what is supposed to be dead code and just a sanity check,
* the target audience is other compiler devs.

r? `@davidtwco`