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/checkout.c

@@ -1045,7 +1045,7 @@ static void update_refs_for_switch(const struct checkout_opts *opts,
 		report_tracking(new_branch_info);
 }
 
-static int add_pending_uninteresting_ref(const char *refname,
+static int add_pending_uninteresting_ref(const char *refname, const char *referent UNUSED,
 					 const struct object_id *oid,
 					 int flags UNUSED, void *cb_data)
 {