Add mfence for ringchannel send #530
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RingChannel::sendmay have chance thatidler.load()happens before thepushwork done.The acquire flags at load only make sured that load after
idler.load()have to be happened afteridler.load(), and last store action inpush(x)keeps only sequence of store order only. Make it in seq_cst order to make sure load action must after push done.