Fix new create_function_3 regression tests not to rely on tuple order.

Robert Haas <rhaas@postgresql.org>

Commit: e37e448650dfd9f4afdf916843015c5cb33346c8
Author: Robert Haas <rhaas@postgresql.org>
Date: 2012-02-14T03:49:07Z
Releases: 9.2.0
Fix new create_function_3 regression tests not to rely on tuple order.

Per buildfarm.

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