Patch: clean up addRangeTableEntryForFunction

Folks,

I've been working with Andrew Gierth (well, mostly he's been doing the
work, as usual) to add WITH ORDINALITY as an option for set-returning
functions.  In the process, he found a minor opportunity to clean up
the interface for $SUBJECT, reducing the call to a Single Point of
Truth for lateral-ness, very likely improving the efficiency of calls
to that function.

Please find attached the patch.

Cheers,
David.
-- 
David Fetter <david@fetter.org> http://fetter.org/
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