Auto merge of #17999 - ShoyuVanilla:issue-17998, r=Veykril

fix: `std::error::Error` is object unsafe

Fixes #17998

I tried to get generic predicates of assoc function itself, not inherited from the parent here;

https://github.com/rust-lang/rust-analyzer/blob/0ae42bd42576566540a84c62e118aa823edcf2ec/crates/hir-ty/src/object_safety.rs#L420-L442

But this naive equality check approach doesn't work when the assoc function has one or more generic paramters like;

```rust
trait Foo {}
trait Bar: Foo {
    fn bar(&self);
}
```

because the generic predicates of the parent, `Bar` is `[^1.0 implements Foo]` and the generic predicates of `fn bar` is `[^1.1 implements Foo]`, which are different.

This PR implements a correct logic for filtering out parent generic predicates for this.

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