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

builtin/describe.c

@@ -149,7 +149,7 @@ static void add_to_known_names(const char *path,
 	}
 }
 
-static int get_name(const char *path, const struct object_id *oid,
+static int get_name(const char *path, const char *referent UNUSED, const struct object_id *oid,
 		    int flag UNUSED, void *cb_data UNUSED)
 {
 	int is_tag = 0;