Revert bogus fixes of HOT-freezing bug

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 08ba67d596a1443c32d0b5300aaad8042729cd41
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2017-11-02T14:51:05Z
Releases: 9.6.6
Revert bogus fixes of HOT-freezing bug

It turns out we misdiagnosed what the real problem was.  Revert the
previous changes, because they may have worse consequences going
forward.  A better fix is forthcoming.

The simplistic test case is kept, though disabled.

Discussion: https://postgr.es/m/20171102112019.33wb7g5wp4zpjelu@alap3.anarazel.de

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