completion: use __gitcomp_builtin in _git_name_rev

The new completable options are:

--always
--exclude
--name-only
--refs
--undefined

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/completion/git-completion.bash

@@ -1825,7 +1825,7 @@ _git_mv ()
 
 _git_name_rev ()
 {
-	__gitcomp "--tags --all --stdin"
+	__gitcomp_builtin name-rev
 }
 
 _git_notes ()