…sion-of-nodejs, r=RalfJung

bump actions/cache to v4

fixes rust-lang#3518.

josh rustc-pull: check that no new root commits get created

A second root was a bad sign in Miri (judging from the description in rust-lang/miri#2583) and seems to be a [bad sign in RA](rust-lang/rust-analyzer#17025 (comment)). So let's add this to the sanity checks.

…numbers of elements

Handle post-merge comments of AVX2 PR

file descriptors: make write take &mut self

Use the interpreted program's TZ variable in localtime_r

This requires a bit of wiring and a new dependency, but the tests should correctly pass now regardless of what the host's time zone is.

Fixes rust-lang/miri#3522

Don’t print `Preparing a sysroot` when `-q`/`--quiet` is passed

Resolves rust-lang#3530.

This also fixes a typo in `cargo miri --help` that I found while trying to run the `--print-sysroot` example.

…initialized'

Tree Borrows: first apply transition, then check protector with new 'initialized'

update host-float comments

Turns out most of these do not have guaranteed precision anyway so it's fine to use host floats (see rust-lang#121793 and rust-lang#118217). The exception are sqrt and mul_add, tracked at rust-lang/miri#3534 and rust-lang/miri#2995.

Add rustbot claim feature

Add rustbot ``claim``, ``release-assignment`` and ``assign-user`` as mentioned in rust-lang#3528.

rustbot issue assignment documentation: https://forge.rust-lang.org/triagebot/issue-assignment.html
pr trigger option documentation: https://forge.rust-lang.org/triagebot/pr-assignment.html#additional-new-pr-trigger-options

Automatic Rustup

move intrinsics tests into dedicated folder

And separate them from "shims" (which are for extern functions we link against).

even out CI runner times

also reorder foreign_items to fix the grouping, and reorder the tests_minimal invocations to be more consistent

update 'unsupported' message

Instead of "the interpreter", just say Miri.

Also be a more more clear about what is expected to be supported and what not (Cc rust-lang/miri#2325).

document unofficially supported OSes

Also tweak the freeBSD testing a bit.

add helper function to declare an extern static for a weak symbol

and use it to make `statx` a regular function and get rid of the syscall