Stop using walk_crate.

compiler/rustc_lint/src/late.rs

@@ -451,9 +451,8 @@ fn late_lint_pass_crate<'tcx, T: LateLintPass<'tcx>>(tcx: TyCtxt<'tcx>, pass: T)
         // since the root module isn't visited as an item (because it isn't an
         // item), warn for it here.
         lint_callback!(cx, check_crate, krate);
-
-        hir_visit::walk_crate(cx, krate);
-
+        tcx.hir().walk_crate(cx);
+        tcx.hir().walk_attributes(cx);
         lint_callback!(cx, check_crate_post, krate);
     })
 }