Auto merge of #8617 - Alexendoo:relax-needless-late-init, r=giraffate

`needless_late_init`: ignore `if let`, `let mut` and significant drops

No longer lints `if let`, personal taste on this one is pretty split, so it probably shouldn't be warning by default. Fixes #8613

```rust
let x = if let Some(n) = y {
    n
} else {
    1
}
```

No longer lints `let mut`, things like the following are not uncommon and look fine as they are

https://github.com/shepmaster/twox-hash/blob/b169c16d86eb8ea4a296b0acb9d00ca7e3c3005f/src/sixty_four.rs#L88-L93

Avoids changing the drop order in an observable way, where the type of `x` has a drop with side effects and something between `x` and the first use also does, e.g.

https://github.com/denoland/rusty_v8/blob/48cc6cb791cac57d22fab1a2feaa92da8ddc9a68/tests/test_api.rs#L159-L167

The implementation of `type_needs_ordered_drop_inner` was changed a bit, it now uses `Ty::has_significant_drop` and reordered the ifs to check diagnostic name before checking the implicit drop impl

changelog: [`needless_late_init`]: No longer lints `if let` statements, `let mut` bindings and no longer significantly changes drop order

0 files changed, 0 insertions, 0 deletions