Renaming a module shouldn’t change path segments referring this module by `super`

In the following code:

```rust
mod foo {
    struct X;

    mod bar {
        use super::X;
    }
}
```

If I rename `foo` to `baz`, the code changes into:

```rust
mod baz {
    struct X;

    mod bar {
        use baz::X;
    }
}
```

Which doesn’t compile any more.