Some combination of recent Rust changes (between 3d86494a0d and
aa57e46e24 from what I can tell) and changes in LLVM 21 (not recently,
as best I can tell) have caused this test to start showing the behavior
we want, so it's time to move this test to a proper place and mark it as
fixed on LLVM 21.
Except for `simd-intrinsic/`, which has a lot of files containing
multiple types like `u8x64` which really are better when hand-formatted.
There is a surprising amount of two-space indenting in this directory.
Non-trivial changes:
- `rustfmt::skip` needed in `debug-column.rs` to preserve meaning of the
test.
- `rustfmt::skip` used in a few places where hand-formatting read more
nicely: `enum/enum-match.rs`
- Line number adjustments needed for the expected output of
`debug-column.rs` and `coroutine-debug.rs`.
