Try to stabilize results of new tuplesort regression test.

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

Commit: baa32ce28b39eccdf384e979dac5ad8be91ff44e
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2019-12-14T20:01:56Z
Releases: 13.0
Try to stabilize results of new tuplesort regression test.

It appears that a concurrent autovacuum/autoanalyze run can cause
changes in the plans expected by this test.  To prevent that, change
the tables it uses to be temp tables --- there's no need for them
to be permanent, and this should save a few cycles too.

Discussion: https://postgr.es/m/3244.1576160824@sss.pgh.pa.us

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