Rewrite TINC test for freezing auxiliary tables on an empty relation.
These tests test for an old bug, where vacuuming an empty AO relation would not advance its relfrozenxid. Doesn't seem very likely for that particular bug to reappear, but seems like a good idea to have some coverage for freezing and relfrozenxid advancement. In this rewritten form, these tests are fairly quick, too (1-2 seconds on my laptop).
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