Combine identical alias arms

compiler/rustc_ty_utils/src/layout.rs

@@ -444,7 +444,7 @@ fn layout_of_uncached<'tcx>(
         }
 
         // Types with no meaningful known layout.
-        ty::Alias(ty::Projection, _) | ty::Alias(ty::Opaque, ..) => {
+        ty::Alias(..) => {
             // NOTE(eddyb) `layout_of` query should've normalized these away,
             // if that was possible, so there's no reason to try again here.
             return Err(LayoutError::Unknown(ty));