Generate pg_stat_get_xact*() functions for relations using macros
This change replaces seven functions definitions by macros.
This is the same idea as
8018ffb or
83a1a1b, taking advantage of the
variable rename done in
8089517 for relation entries.
Author: Bertrand Drouvot
Discussion: https://postgr.es/m/
631e3084-c5d9-8463-7540-
fcff4674caa5@gmail.com