This PR allows using `#[repr(simd)]` on ADTs containing a
single array field:

```rust
 #[repr(simd)] struct S0([f32; 4]);
 #[repr(simd)] struct S1<const N: usize>([f32; N]);
 #[repr(simd)] struct S2<T, const N: usize>([T; N]);
```

This should allow experimenting with portable packed SIMD
abstractions on nightly that make use of const generics.

The memory allocation in vec might panic in the case of capacity
overflow. Move the allocation outside the function to fix the test.

Backtrace frames might include column numbers.
Print them if they are included.

…ackline in source rendering

…locks

…backline, r=jyn514

Ensure that the source code display is working with DOS backline

Fixes rust-lang#76361.

cc ```@lzutao```
r? ```@jyn514```

…r=oli-obk

Introduce `TypeVisitor::BreakTy`

Implements MCP rust-lang/compiler-team#383.
r? `@ghost`
cc `@lcnr` `@oli-obk`

~~Blocked on FCP in rust-lang/compiler-team#383.~~

Support repr(simd) on ADTs containing a single array field

This is a squash and rebase of `@gnzlbg's` rust-lang#63531

I've never actually written code in the compiler before so just fumbled my way around until it would build 😅

I imagine there'll be some work we need to do in `rustc_codegen_cranelift` too for this now, but might need some input from `@bjorn3` to know what that is.

cc `@rust-lang/project-portable-simd`

-----

This PR allows using `#[repr(simd)]` on ADTs containing a single array field:

```rust
 #[repr(simd)] struct S0([f32; 4]);
 #[repr(simd)] struct S1<const N: usize>([f32; N]);
 #[repr(simd)] struct S2<T, const N: usize>([T; N]);
```

This should allow experimenting with portable packed SIMD abstractions on nightly that make use of const generics.

Make codegen tests compatible with extra inlining

Add column number support to Backtrace

Backtrace frames might include column numbers.
Print them if they are included.

…r=oli-obk

Limit storage duration of inlined always live locals

Closes rust-lang#76375.

document that __rust_alloc is also magic to our LLVM fork

Based on [comments](rust-lang#79045 (comment)) by ```@tmiasko``` and ```@bjorn3.```

clarify `span_label` documentation

Fixes rust-lang#71857.

r? `@estebank`

cc `@RalfJung`

…tml-tag-lint, r=jyn514

Code block invalid html tag lint

Fixes rust-lang#79095

r? `@jyn514`