Various changes to improve latency of background thread loop. #1880
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This PR contains mostly small changes to improve the latency of the background thread loop. Mostly comprised of using references and
std::movewhen possible to avoid extraneous copies. Also introducesTensorQueue::PushMessagesToQueuemethod to avoid repeatedly taking a lock on a mutex when replacing uncached messages to the state queue in the previous logic when each message was replaced individually withTensorQueue::PushMessageToQueue. Lastly, changes default CPU compilation flags to-O3from-O2.