Make crate_hash not iterate over hir_crate owners anymore

Author: oli-obk

compiler/rustc_middle/src/hir/map.rs

@@ -1173,10 +1173,12 @@ pub(super) fn crate_hash(tcx: TyCtxt<'_>, _: LocalCrate) -> Svh {
         debugger_visualizers.hash_stable(&mut hcx, &mut stable_hasher);
         if tcx.sess.opts.incremental.is_some() {
             let definitions = tcx.untracked().definitions.freeze();
-            let mut owner_spans: Vec<_> = krate
-                .owners
-                .iter_enumerated()
-                .filter_map(|(def_id, info)| {
+            let mut owner_spans: Vec<_> = definitions
+                .def_path_table()
+                .def_keys()
+                .filter_map(|local_def_index| {
+                    let def_id = LocalDefId { local_def_index };
+                    let info = tcx.hir_owner(def_id);
                     let _ = info.as_owner()?;
                     let def_path_hash = definitions.def_path_hash(def_id);
                     let span = tcx.source_span(def_id);