Rollup merge of rust-lang#130618 - m-ou-se:skip-query, r=compiler-errors

Skip query in get_parent_item when possible.

For HirIds with a non-zero item local id, `self.parent_owner_iter(hir_id).next()` just returns the same HirId with the item local id set to 0, but also does a query to retrieve the Node which is ignored here, which seems wasteful.

Author: compiler-errors

compiler/rustc_middle/src/hir/map/mod.rs

@@ -598,7 +598,10 @@ impl<'hir> Map<'hir> {
     /// in the HIR which is recorded by the map and is an item, either an item
     /// in a module, trait, or impl.
     pub fn get_parent_item(self, hir_id: HirId) -> OwnerId {
-        if let Some((def_id, _node)) = self.parent_owner_iter(hir_id).next() {
+        if hir_id.local_id != ItemLocalId::ZERO {
+            // If this is a child of a HIR owner, return the owner.
+            hir_id.owner
+        } else if let Some((def_id, _node)) = self.parent_owner_iter(hir_id).next() {
             def_id
         } else {
             CRATE_OWNER_ID