llvm-project takes > 1GB storage space and a long time to download.
It's better to not download it unless needed.

This is needed for Atomic::from_mut.

This reverts commit 5ef1db3.

Instead of a few hardcoded cfg(target_arch = ..) like before.

This was missed in PR rust-lang#75465. As a result, a few places have been using
the full body span of functions, instead of just the header span.

Continuation of rust-lang#74526

Adds the #[track_caller] attribute to almost all panicking Cell
functions. The ones that borrow two Cells in their function
body are spared, because the panic location helps pinpoint
which of the two borrows failed. You'd need to have
full debuginfo and backtraces enabled together with column
info in order to be able to discern the cases.
Column info is only available on non-Windows platforms.

…ces, r=Mark-Simulacrum

Don't download/sync llvm-project submodule if download-ci-llvm is set

llvm-project takes > 1GB storage space and a long time to download.
It's better to not download it unless needed.

Record `tcx.def_span` instead of `item.span` in crate metadata

This was missed in PR rust-lang#75465. As a result, a few places have been using
the full body span of functions, instead of just the header span.

…r_opts_flag, r=oli-obk

[mir-opt] Introduce a new flag to enable experimental/unsound mir opts

This implements part of rust-lang/compiler-team#319. The exact name of this flag was not decided as part of that MCP and some people expressed that it should include "unsound" in some way.

I've chosen to use `enable-experimental-unsound-mir-opts` as the name. While long, I don't think that matters too much as really it will only be used by some mir-opt tests. If you object or have a better name, please leave a comment!

r? @oli-obk
cc @rust-lang/wg-mir-opt @RalfJung

emit errors during AbstractConst building

There changes are currently still untested, so I don't expect this to pass CI 😆

It seems to me like this is the direction we want to go in, though we didn't have too much of a discussion about this.

r? @oli-obk

…-from-mut, r=Amanieu

Add cfg(target_has_atomic_equal_alignment) and use it for Atomic::from_mut.

Fixes some platform-specific problems with rust-lang#74532 by using the actual alignment of the types instead of hardcoding a few `target_arch`s.

r? @RalfJung

Liballoc bench vec use mem take not replace

Miri: more informative deallocation error messages

Make sure we show the affected AllocId.

r? @oli-obk

Typo fix: "satsify" -> "satisfy"

…ulacrum

Add #[track_caller] to more panicking Cell functions

Continuation of rust-lang#74526

Adds the #[track_caller] attribute to almost all panicking Cell
functions. The ones that borrow two Cells in their function
body are spared, because the panic location helps pinpoint
which of the two borrows failed. You'd need to have
full debuginfo and backtraces enabled together with column
info in order to be able to discern the cases.
Column info in debuginfo is only available on non-Windows platforms.