Infinite recursion when generating debuginfo

```rust
use std::marker::PhantomData;

pub struct AB<T: 'static> {
    pub a: PhantomData<T>,
    pub b: *const AB<(T, T)>,
}

fn main() {
    std::hint::black_box(AB::<()> { a: PhantomData, b: std::ptr::null() });
}
```
```console
$ rustc +7278554d82fa474a4e8b5c67afb009e11e41a841 -g a.rs
Terminated
```

It was reintroduced by #144407 to resolve a different issue.