Rollup merge of rust-lang#109410 - fmease:iat-alias-kind-inherent, r=…

…compiler-errors

Introduce `AliasKind::Inherent` for inherent associated types

Allows us to check (possibly generic) inherent associated types for well-formedness.
Type inference now also works properly.

Follow-up to rust-lang#105961. Supersedes rust-lang#108430.
Fixes rust-lang#106722.
Fixes rust-lang#108957.
Fixes rust-lang#109768.
Fixes rust-lang#109789.
Fixes rust-lang#109790.

~Not to be merged before rust-lang#108860 (`AliasKind::Weak`).~

CC `@jackh726`
r? `@compiler-errors`

`@rustbot` label T-types F-inherent_associated_types

clippy_lints/src/dereference.rs

@@ -1424,6 +1424,7 @@ fn ty_auto_deref_stability<'tcx>(
                 continue;
             },
             ty::Param(_) => TyPosition::new_deref_stable_for_result(precedence, ty),
+            ty::Alias(ty::Inherent, _) => unreachable!("inherent projection should have been normalized away above"),
             ty::Alias(ty::Projection, _) if ty.has_non_region_param() => {
                 TyPosition::new_deref_stable_for_result(precedence, ty)
             },