Rollup merge of #112781 - compiler-errors:new-solver-tait-overlaps-hidden, r=lcnr

Don't consider TAIT normalizable to hidden ty if it would result in impossible item bounds

See test for example where we shouldn't consider it possible to alias-relate a TAIT and hidden type.

r? `@lcnr`

compiler/rustc_borrowck/src/type_check/mod.rs

@@ -1065,7 +1065,8 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
                         )?;
 
                         ocx.infcx.add_item_bounds_for_hidden_type(
-                            opaque_type_key,
+                            opaque_type_key.def_id.to_def_id(),
+                            opaque_type_key.substs,
                             cause,
                             param_env,
                             hidden_ty.ty,