This picks up a fix in `rustc_apfloat` [1] that resolves a problem with`fma`.[1]:https://github.com/rust-lang/rustc_apfloat/releases/tag/rustc_apfloat-v0.2.3%2Bllvm-462a31f5a5ab

Pick up the latest version of iai-callgrind, which includes some outputimprovements.Changelog:https://github.com/iai-callgrind/iai-callgrind/releases

This CI workflow will run thehttps://github.com/rust-lang/josh-synctool on Mondays and Thursdays. It will try to do a pull (sync stdarchchanges from rust-lang/rust into this repository). When it runs, threethings can happen:- There are no rustc changes to be pulled, the bot does nothing.- There are some new changes to be pulled. In that case, the bot willeither open or update an existing PR titled "Rustc pull update" on thisrepository with the changes. After the PR is merged, we should ideallydo the opposite sync (push) manually.- The pull fails (usually because of a merge conflict), or the botdetermines that a pull PR has been opened for more than a week withoutbeing merged. In that case, it will post a ping tohttps://rust-lang.zulipchat.com/#narrow/channel/219381-t-libs/topic/compiler-builtins.20subtree.20sync.20automation/with/528482375.

```textwarning: function `f32_to_bits` is never used   --> libm/src/math/support/float_traits.rs:367:14    |367 | pub const fn f32_to_bits(x: f32) -> u32 {    |              ^^^^^^^^^^^    |    = note: `#[warn(dead_code)]` on by defaultwarning: function `f64_to_bits` is never used   --> libm/src/math/support/float_traits.rs:381:14    |381 | pub const fn f64_to_bits(x: f64) -> u64 {    |              ^^^^^^^^^^^warning: `libm` (lib) generated 2 warnings```This is a false positive, see RUST-144060.

Match the new CI-created PRs:rust-lang/compiler-builtins#974.

This alias was added in 9897bfb8a ("Fix memset arguments for MSP430target"), which predates `core::ffi`. Now that it exists we can just use`core::ffi::c_int`.

Fix the return type of `memcmp` and `bcmp` builtin functions on targetswith a `c_int` other than `i32`.Linked issue:rust-lang#144076

This updates the rust-version file to8231065.

Pull recent changes fromhttps://github.com/rust-lang/rust via Josh.Upstream ref:8231065Filtered ref: e13c0be8f13737c64082b89ce834546079767ac4This merge was created usinghttps://github.com/rust-lang/josh-sync.