011e3bb9ac
fix: Wrong `Sized` predicate for `generic_predicates_for_param`
I found this gathers wrong `Self: Sized` bound while implementing object safety, though I couldn't find proper test for this.
If we call `generic_predicates_for_param` to `Bar` in the following code;
```rust
trait Foo<T: ?Sized> {}
trait Bar<T: Foo<Self> + ?Sized> {}
```
it returns `T: Sized` and `Self: Sized` bound, because normaly, the `?Sized` bound applied properly in L1059 with;
3723e5910c/crates/hir-ty/src/lower.rs (L1035-L1061)
But we filter them before it is lowered with that function here;
3723e5910c/crates/hir-ty/src/lower.rs (L1540-L1586)
So, the `?Sized` bounded params are not gathered into `ctx.unsized_types` and thus we are applying them implicit `Sized` bound here;
3723e5910c/crates/hir-ty/src/lower.rs (L1591-L1602)
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