Stage 1 check has been supported since rust-lang#81064.
 rust-lang#81064 changed the error message for this, but I don't think there's any reason we should prevent using it.
I tested locally and `keep-stage` works fine. Don't give a hard error when trying to use it.

Co-authored-by: Guillaume Gomez <guillaume1.gomez@gmail.com>

Fixes a warning:

warning: llvm-wrapper/RustWrapper.cpp:159:11: warning: enumeration values 'AllocatedPointer' and 'AllocAlign' not handled in switch [-Wswitch]
warning:   switch (Kind) {
warning:           ^

Which was fall out from 130a1df.

When we're downloading based on a CI commit, that can still be -beta- or even
-stable-, so we should lookup the channel it was built with.

…ulacrum

Support `x --keep-stage 0 check`

Stage 1 check has been supported since rust-lang#81064.
 rust-lang#81064 changed the error message for this, but I don't think there's any reason we should prevent using it.
I tested locally and `keep-stage` works fine.

r? `@Mark-Simulacrum`

…gs-webcomponents, r=GuillaumeGomezp

rustdoc: align invalid-html-tags lint with commonmark spec

Remove `parent_pat` from `TopInfo`

We can get the parent pat from the hir map.

Do not allow bad projection term to leak into the type checker

Fixes rust-lang#99828

…7, r=joshtriplett

Reset directory iteration in remove_dir_all

Fixes rust-lang#99934

…lan-DPC

Remove more Clean trait implementations

This time it even allowed to remove a function.

Follow-up of rust-lang#99638.

r? `@notriddle`

…uviper

Also gate AllocatedPointer and AllocAlign definitions by LLVM_VERSION_GE

Fixes a warning:

```
warning: llvm-wrapper/RustWrapper.cpp:159:11: warning: enumeration values 'AllocatedPointer' and 'AllocAlign' not handled in switch [-Wswitch]
warning:   switch (Kind) {
warning:           ^
```

Which was fall out from 130a1df.

Fixes rust-lang#99955

…channel, r=jyn514

Discover channel for LLVM download

r? `@jyn514`
cc `@RalfJung`

Reported on Zulip: https://rust-lang.zulipchat.com/#narrow/stream/122651-general/topic/No.20prebuilt.20LLVM.20for.20the.20beta.20branch.3F