Add some more regression tests for DROP IF EXISTS.

Robert Haas <rhaas@postgresql.org>

Commit: 3301c83536e9da1e573e24ded2e610062dbf9cdc
Author: Robert Haas <rhaas@postgresql.org>
Date: 2011-10-20T01:00:45Z
Releases: 9.2.0
Add some more regression tests for DROP IF EXISTS.

KaiGai Kohei

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