Rollup merge of #106829 - compiler-errors:more-alias-combine, r=spastorino

Unify `Opaque`/`Projection` handling in region outlives code

They share basically identical paths in most places which are even easier to unify now that they're both `ty::Alias`

r? types

compiler/rustc_traits/src/implied_outlives_bounds.rs

@@ -154,9 +154,8 @@ fn implied_bounds_from_components<'tcx>(
             match component {
                 Component::Region(r) => Some(OutlivesBound::RegionSubRegion(sub_region, r)),
                 Component::Param(p) => Some(OutlivesBound::RegionSubParam(sub_region, p)),
-                Component::Projection(p) => Some(OutlivesBound::RegionSubProjection(sub_region, p)),
-                Component::Opaque(def_id, substs) => {
-                    Some(OutlivesBound::RegionSubOpaque(sub_region, def_id, substs))
+                Component::Alias(kind, p) => {
+                    Some(OutlivesBound::RegionSubAlias(sub_region, kind, p))
                 }
                 Component::EscapingProjection(_) =>
                 // If the projection has escaping regions, don't