Add comment about memory reordering to PredicateLockTupleRowVersionLink.

Dan Ports, per head-scratching from Simon Riggs and myself.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/71932ecc2b6ca0d748176a7e8b11d3575bf4caf3

Modified Files
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src/backend/storage/lmgr/predicate.c |    3 +++
1 files changed, 3 insertions(+), 0 deletions(-)

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