Make ALTER TABLE revalidate uniqueness and exclusion constraints.

Robert Haas <rhaas@postgresql.org>

Commit: 8ceb24568054232696dddc1166a8563bc78c900a
Author: Robert Haas <rhaas@postgresql.org>
Date: 2011-01-21T03:44:10Z
Releases: 9.1.0
Make ALTER TABLE revalidate uniqueness and exclusion constraints.

Failure to do so can lead to constraint violations.  This was broken by
commit 1ddc2703a936d03953657f43345460b9242bbed1 on 2010-02-07, so
back-patch to 9.0.

Noah Misch.  Regression test by me.

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