const runtime.active_spin

3 uses

	runtime (current package)
		lock_futex.go#L30: 	active_spin     = 4
		lock_futex.go#L77: 		spin = active_spin
		proc.go#L6094: 	if i >= active_spin || ncpu <= 1 || gomaxprocs <= int32(sched.npidle+sched.nmspinning)+1 {