Fix memory leak in IndexScan node with reordering

Alexander Korotkov <akorotkov@postgresql.org>

Commit: ac2303aa0386d2fa26cc3e237076b49827b39d6a
Author: Alexander Korotkov <akorotkov@postgresql.org>
Date: 2022-02-14T00:32:34Z
Releases: 13.7
Fix memory leak in IndexScan node with reordering

Fix ExecReScanIndexScan() to free the referenced tuples while emptying the
priority queue.  Backpatch to all supported versions.

Discussion: https://postgr.es/m/CAHqSB9gECMENBQmpbv5rvmT3HTaORmMK3Ukg73DsX5H7EJV7jw%40mail.gmail.com
Author: Aliaksandr Kalenik
Reviewed-by: Tom Lane, Alexander Korotkov
Backpatch-through: 10

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