Remove HirId -> LocalDefId map from HIR.

compiler/rustc_hir/src/hir.rs

@@ -831,8 +831,6 @@ pub struct OwnerNodes<'tcx> {
     pub nodes: IndexVec<ItemLocalId, Option<ParentedNode<'tcx>>>,
     /// Content of local bodies.
     pub bodies: SortedMap<ItemLocalId, &'tcx Body<'tcx>>,
-    /// Non-owning definitions contained in this owner.
-    pub local_id_to_def_id: SortedMap<ItemLocalId, LocalDefId>,
 }
 
 impl<'tcx> OwnerNodes<'tcx> {
@@ -862,7 +860,6 @@ impl fmt::Debug for OwnerNodes<'_> {
                     .collect::<Vec<_>>(),
             )
             .field("bodies", &self.bodies)
-            .field("local_id_to_def_id", &self.local_id_to_def_id)
             .field("hash_without_bodies", &self.hash_without_bodies)
             .field("hash_including_bodies", &self.hash_including_bodies)
             .finish()