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/20171102112019.33wb7g5wp4zpj...@alap3.anarazel.de

Branch
------
REL_10_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/7a95966bc03cd8af08825de235ea896d682d62bb

Modified Files
--------------
src/backend/access/heap/heapam.c      | 109 +++++++---------------------------
src/backend/access/heap/pruneheap.c   |   4 +-
src/backend/commands/vacuumlazy.c     |  20 +++----
src/backend/executor/execMain.c       |   6 +-
src/include/access/heapam.h           |   3 -
src/test/isolation/isolation_schedule |   1 -
6 files changed, 38 insertions(+), 105 deletions(-)


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