Reduce impact of btree page reuse on Hot Standby by fixing off-by-1 error.
WAL records of type XLOG_BTREE_REUSE_PAGE were generated using a
latestRemovedXid one higher than actually needed because xid used was
page opaque->btpo.xact rather than an actually removed xid.
Noticed on an otherwise quiet system by Noah Misch.

Noah Misch and Simon Riggs

Branch
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REL9_0_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/5cd81b8df0a9f3e4cb407e815b9a789138fd0356

Modified Files
--------------
src/backend/access/nbtree/nbtpage.c |   12 +++++++++++-
1 files changed, 11 insertions(+), 1 deletions(-)


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