Auto merge of rust-lang#119234 - aDotInTheVoid:ast-lowering-asserts, …

…r=<try>

ast_lowering: Make some asserts in ID generation debug only.

Ran into this code, as was kinda surprised these are still here in release. These methods seem hot.

r? `@ghost`

`@bors` try `@rust-timer` queue

compiler/rustc_ast_lowering/src/lib.rs

@@ -721,7 +721,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                 v.insert(local_id);
                 self.item_local_id_counter.increment_by(1);
 
-                assert_ne!(local_id, hir::ItemLocalId::new(0));
+                debug_assert_ne!(local_id, hir::ItemLocalId::new(0));
                 if let Some(def_id) = self.opt_local_def_id(ast_node_id) {
                     self.children.push((def_id, hir::MaybeOwner::NonOwner(hir_id)));
                 }