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f6faef4475
make Cell::swap panic if the Cells partially overlap
The following function ought to be sound:
```rust
fn as_cell_of_array<T, const N: usize>(c: &[Cell<T>; N]) -> &Cell<[T; N]> {
unsafe { transmute(c) }
}
```
However, due to `Cell::swap`, it currently is not -- safe code can [cause a use-after-free](https://play.rust-lang.org/?version=nightly&mode=debug&edition=2018&gist=c9415799722d985ff7d2c2c997b724ca). This PR fixes that.
Fixes https://github.com/rust-lang/rust/issues/80778
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| .. | ||
| alloc | ||
| backtrace@99faef833f | ||
| core | ||
| panic_abort | ||
| panic_unwind | ||
| portable-simd | ||
| proc_macro | ||
| profiler_builtins | ||
| rtstartup | ||
| rustc-std-workspace-alloc | ||
| rustc-std-workspace-core | ||
| rustc-std-workspace-std | ||
| std | ||
| stdarch@d77878b729 | ||
| sysroot | ||
| test | ||
| unwind | ||