[COMMITTERS] pgsql: Revert bogus fixes of HOT-freezing bug

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

Branch
------
REL9_4_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/ef0339ee5dcf933949f3751d98771e03b8c19aa2

Modified Files
--------------
src/backend/access/heap/heapam.c      | 143 +++++++++++-----------------------
src/backend/access/heap/pruneheap.c   |   4 +-
src/backend/commands/vacuumlazy.c     |  16 ++--
src/backend/executor/execMain.c       |   6 +-
src/include/access/heapam.h           |   3 -
src/test/isolation/isolation_schedule |   1 -
6 files changed, 60 insertions(+), 113 deletions(-)


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