Adjust span labels for `HIDDEN_GLOB_REEXPORTS`
Addresses https://github.com/rust-lang/rust/pull/111378#issuecomment-1581226063.
### Before This PR
The possibility that the private item comes before the glob re-export was not account for, causing the span label messages to say "but private item here shadows it" before "the name `Foo` in the type namespace is supposed to be publicly re-exported here".
### After This PR
```rust
warning: private item shadows public glob re-export
--> $DIR/hidden_glob_reexports.rs:9:5
|
LL | struct Foo;
| ^^^^^^^^^^^ the private item here shadows the name `Foo` in the type namespace
...
LL | pub use self::inner::*;
| -------------- but it is supposed to be publicly re-exported here
|
= note: `#[warn(hidden_glob_reexports)]` on by default
warning: private item shadows public glob re-export
--> $DIR/hidden_glob_reexports.rs:27:9
|
LL | pub use self::inner::*;
| -------------- the name `Foo` in the type namespace is supposed to be publicly re-exported here
LL |
LL | use self::other::Foo;
| ^^^^^^^^^^^^^^^^ but the private item here shadows it
```
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