pgsql: Make HEAP_LOCK/HEAP2_LOCK_UPDATED replay reset HEAP_XMAX_INVALID

Make HEAP_LOCK/HEAP2_LOCK_UPDATED replay reset HEAP_XMAX_INVALID.

0ac5ad5 started to compress infomask bits in WAL records. Unfortunately
the replay routines for XLOG_HEAP_LOCK/XLOG_HEAP2_LOCK_UPDATED forgot to
reset the HEAP_XMAX_INVALID (and some other) hint bits.

Luckily that's not problematic in the majority of cases, because after a
crash/on a standby row locks aren't meaningful. Unfortunately that does
not hold true in the presence of prepared transactions. This means that
after a crash, or after promotion, row level locks held by a prepared,
but not yet committed, prepared transaction might not be enforced.

Discussion: 20160715192319(dot)ubfuzim4zv3rqnxv(at)alap3(dot)anarazel(dot)de
Backpatch: 9.3, the oldest branch on which 0ac5ad5 is present.

Branch
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REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/f66828ba6e6bb0024433b4cb88afc4d7cecbf278

Modified Files
--------------
src/backend/access/heap/heapam.c | 4 ++++
1 file changed, 4 insertions(+)