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

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

Commit: 60e67c163232582f8b9dd80d7a51e6ed97fe2745
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2007-03-19T16:30:40Z
Releases: 8.2.4
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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