Stop using walk_crate.

compiler/rustc_incremental/src/persist/dirty_clean.rs

@@ -142,7 +142,7 @@ pub fn check_dirty_clean_annotations(tcx: TyCtxt<'_>) {
         krate.visit_all_item_likes(&mut dirty_clean_visitor);
 
         let mut all_attrs = FindAllAttrs { tcx, found_attrs: vec![] };
-        intravisit::walk_crate(&mut all_attrs, krate);
+        tcx.hir().walk_attributes(&mut all_attrs);
 
         // Note that we cannot use the existing "unused attribute"-infrastructure
         // here, since that is running before codegen. This is also the reason why