Review for pg_dump: Sort overloaded functions in deterministic order

Patch looks good, all concerns that had been raised previously have
been addressed in this version of the patch.

The only thing that IMO needs to change is a stylistic issue:

if (fout->remoteVersion >= 80200)
{
[...]
(fout->remoteVersion >= 80400) ?
"pg_catalog.pg_get_function_identity_arguments(oid)" : "NULL::text",
[...]
}

Please just create a whole new

if (fout->remoteVersion >= 80400)
{
[...]
}

here.

Other than that, the feature works as advertised and does not
negatively affect runtime or memory consumption (the new field is only
added to functions / aggregates).

Please send a new version of the patch that changes the above
mentioned item, the patch also needs rebasing (off by a couple of
lines).