Re-delay a resolve `bug`

For the code pattern reported in
<https://github.com/rust-lang/rust/issues/133272>,

```rs
impl Foo {
   fn fun() {
        let S { ref Self } = todo!();
   }
}
```

<https://github.com/rust-lang/rust/pull/121208> converted this to a
`span_bug` from a `span_delayed_bug` because this specific self-ctor
code pattern lacked test coverage. It turns out this can be hit but we
just lacked test coverage, so change it back to a `span_delayed_bug` and
add a target tested case.

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