…c)]`

…gnostic)]`

…anslatable

…agnostic)]`

…agnostic)]`

…nostic)]`

…gnostic)]`

…ostic)]`

All regressions that were blocking usage of ArArchiveBuilder should now
be fixed.

…stic, r=nnethercote

Get rid of some `#[allow(rustc::untranslatable_diagnostic)]`

`@rustbot` label +A-translation
cc rust-lang#100717

…=jieyouxu

Support reading thin archives in ArArchiveBuilder

And switch to using ArArchiveBuilder with the LLVM backend too now that all regressions are fixed.

Fixes rust-lang#107407
Fixes rust-lang#107162
rust-lang#107495 has been fixed in a previous PR already.

Fix warnings in rmake tests on `x86_64-unknown-linux-gnu`

r? ````@jieyouxu````

This PR fixes some warnings I saw in rmake tests. I didn't deny more warnings in this PR until ````@jieyouxu```` gives their opinion, but maybe we should actually deny all warnings in `rmake.rs` files?

I've also only looked at non-ignored tests on `x86_64-unknown-linux-gnu`, and denying warnings would require a try build for all targets 😓.

Only try to modify file times of a writable file

- First commit fixes a failure that I was running into locally trying to build a stage 1 `./x build library --stage 1` on windows due to trying to modify file times of a read-only file.
- Second commit introduces a `set_file_times` helper which opens a given path as a file in r+w mode and then sets file times. This should hopefully make setting file times less error prone, since trying to set file times on read-only file also happened in rust-lang#127850. (And apparently it only fails locally on Windows or something weird like that.)

…jieyouxu

Use `assert_matches` around the compiler more

It's a useful assertion, especially since it actually prints out the LHS.