Use super_visit_with in a couple of visit_binder methods.

Because it's equivalent but simpler to what's currently there.

compiler/rustc_infer/src/infer/opaque_types.rs

@@ -470,7 +470,7 @@ where
         &mut self,
         t: &ty::Binder<'tcx, T>,
     ) -> ControlFlow<Self::BreakTy> {
-        t.as_ref().skip_binder().visit_with(self);
+        t.super_visit_with(self);
         ControlFlow::CONTINUE
     }