rustfmt deletes comments in "or" patterns

This:
```rust
fn main() {
    let (/**/ () /**/ | /**/ () /**/) = ();
}
```
gets turned into this:
```rust
fn main() {
    let (() | ()) = ();
}
```
([play](https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=100609deeb21058445b333c913ae4287))


cc @fee1-dead 