Merge branch 'jc/refs-symref-referent'

The refs API has been taught to give symref target information to
the users of ref iterators, allowing for-each-ref and friends to
avoid an extra ref_resolve_* API call per a symbolic ref.

* jc/refs-symref-referent:
  ref-filter: populate symref from iterator
  refs: add referent to each_ref_fn
  refs: keep track of unresolved reference value in iterators

reflog.c

@@ -300,6 +300,7 @@ int should_expire_reflog_ent_verbose(struct object_id *ooid,
 }
 
 static int push_tip_to_list(const char *refname UNUSED,
+			    const char *referent UNUSED,
 			    const struct object_id *oid,
 			    int flags, void *cb_data)
 {