YJIT: Fix a warning from nightly rustHEADmaster

No plan about migrating to the 2024 edition yet (it's not even
available yet), but this is a simple enough suggestion so we can just
take it.

```
warning: this method call resolves to `<&Box<[T]> as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<Box<[T]> as IntoIterator>::into_iter` in Rust 2024
    --> ../yjit/src/core.rs:1003:49
     |
1003 |         formatter.debug_list().entries(branches.into_iter()).finish()
     |                                                 ^^^^^^^^^
     |
     = warning: this changes meaning in Rust 2024
     = note: `#[warn(boxed_slice_into_iter)]` on by default
help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
     |
1003 |         formatter.debug_list().entries(branches.iter()).finish()
     |                                                 ~~~~
help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
     |
1003 |         formatter.debug_list().entries(IntoIterator::into_iter(branches)).finish()
     |                                        ++++++++++++++++++++++++        ~
```

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