Add support for move operations on hazptr-holder. Other optimizations.
Summary: - Support empty hazptr_holder, move constructor and assignment operator - Limit thread caching to the default domain to improve performance of thread caching - Fix unnecessary calls to stats singleton - Use the mprotect version of AsymmetricMemoryBarrier for reducing the overhead of bulkReclaim(). - Update read-side benchmark results Reviewed By: djwatson Differential Revision: D5292885 fbshipit-source-id: bc5713ac95492a7114e1e467e71d2278e64b165d
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