Revert "Use CP_SMALL_TLIST for hash aggregate"

Jeff Davis <jdavis@postgresql.org>

Commit: 926ecf83c0bab7e985eaf5727bb69cdf8ce6b067
Author: Jeff Davis <jdavis@postgresql.org>
Date: 2020-07-13T06:08:16Z
Releases: 13.0
Revert "Use CP_SMALL_TLIST for hash aggregate"

This reverts commit 4cad2534da6d17067d98cf04be2dfc1bda8f2cd0 due to a
performance regression. It will be replaced by a new approach in an
upcoming commit.

Reported-by: Andres Freund
Discussion: https://postgr.es/m/20200614181418.mx4bvljmfkkhoqzl@alap3.anarazel.de
Backpatch-through: 13

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