Fix 8.2 breakage of domains over array types, and add a regression test case

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

Commit: 9bc933b2125a5358722490acbc50889887bf7680
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2007-03-19T16:30:32Z
Releases: 8.3.0
Fix 8.2 breakage of domains over array types, and add a regression test case
to cover it.  Per report from Anton Pikhteryev.

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