Rollup merge of #115882 - aliemjay:diag-name-region-1, r=compiler-errors

improve the suggestion of `generic_bound_failure`

- Fixes #115375
- suggest the bound in the correct scope: trait or impl header vs assoc item. See `tests/ui/suggestions/lifetimes/type-param-bound-scope.rs`
- don't suggest a lifetime name that conflicts with the other late-bound regions of the function:
```rust
type Inv<'a> = *mut &'a ();
fn check_bound<'a, T: 'a>(_: T, _: Inv<'a>) {}
fn test<'a, T>(_: &'a str, t: T, lt: Inv<'_>) { // suggests a new name `'a`
    check_bound(t, lt); //~ ERROR
}
```

0 files changed, 0 insertions, 0 deletions