Add an "argisrow" field to NullTest nodes, following a plan made way back in

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 7839d35991f1c79a291e67635d5f4c5750c16e9b
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2010-01-01T23:03:10Z
Releases: 9.0.0
Add an "argisrow" field to NullTest nodes, following a plan made way back in
8.2beta but never carried out.  This avoids repetitive tests of whether the
argument is of scalar or composite type.  Also, be a bit more paranoid about
composite arguments in some places where we previously weren't checking.

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