Fix bugs in evaluating WellFormed predicates

- List the nestsed obligations in an order that works with the
  single pass used by evaluation
- Propagate recursion depth correctly

compiler/rustc_typeck/src/check/check.rs

@@ -561,7 +561,7 @@ fn check_opaque_meets_bounds<'tcx>(
         let misc_cause = traits::ObligationCause::misc(span, hir_id);
 
         let (_, opaque_type_map) = inh.register_infer_ok_obligations(
-            infcx.instantiate_opaque_types(def_id.to_def_id(), hir_id, param_env, &opaque_ty, span),
+            infcx.instantiate_opaque_types(def_id, hir_id, param_env, &opaque_ty, span),
         );
 
         for (def_id, opaque_defn) in opaque_type_map {

compiler/rustc_typeck/src/impl_wf_check/min_specialization.rs

@@ -337,6 +337,7 @@ fn check_predicates<'tcx>(
             infcx,
             tcx.param_env(impl1_def_id),
             tcx.hir().local_def_id_to_hir_id(impl1_def_id),
+            0,
             arg,
             span,
         ) {