Fix an atomic memory ordering issue in SIMD version of the ConcurrentHashMap.
Summary: The find path reads a node that the insert path writes; they need to have acquire/release semantics due to the node being allocated on the fly. Reviewed By: yfeldblum, magedm Differential Revision: D22937394 fbshipit-source-id: c1497ed1764cd43e396bc520e9b716cdfe29e5ca
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