const runtime.waitReasonIOWait

3 uses

	runtime (current package)
		netpoll.go#L438: 		gopark(netpollblockcommit, unsafe.Pointer(gpp), waitReasonIOWait, traceEvGoBlockNet, 5)
		runtime2.go#L990: 	waitReasonIOWait                                  // "IO wait"
		runtime2.go#L1020: 	waitReasonIOWait:                "IO wait",