Run rustfmt on `tests/codegen/`.

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`.

1 files changed, 3 insertions, 1 deletions

diff --git a/tests/codegen/issues/issue-75546.rs b/tests/codegen/issues/issue-75546.rs
index 992ef97d624..1132c8ab509 100644
--- a/tests/codegen/issues/issue-75546.rs
+++ b/tests/codegen/issues/issue-75546.rs
@@ -9,7 +9,9 @@ pub fn issue_75546() {
     let mut i = 1u32;
     while i < u32::MAX {
         // CHECK-NOT: panic
-        if i == 0 { panic!(); }
+        if i == 0 {
+            panic!();
+        }
         i += 1;
     }
 }