emit the suspicious_auto_trait_impls for negative impls as well #108804

#![feature(negative_impls)]

struct Foo<T, U>(T, U);
impl<T> !Send for Foo<T, T> {}

struct Bar<T, U>(T, U);
unsafe impl<T> Send for Bar<T, T> {}

warning: cross-crate traits with a default impl, like `Send`, should not be specialized
 --> src/lib.rs:7:1
  |
7 | unsafe impl<T> Send for Bar<T, T> {}
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = warning: this will change its meaning in a future release!
  = note: for more information, [see issue #93367 <https://github.com/rust-lang/rust/issues/93367>](https://github.com/rust-lang/rust/issues/93367)
  = note: `T` is mentioned multiple times
note: try using the same sequence of generic parameters as the struct definition
 --> src/lib.rs:6:1
  |
6 | struct Bar<T, U>(T, U);
  | ^^^^^^^^^^^^^^^^
  = note: `#[warn(suspicious_auto_trait_impls)]` on by default