//
	// If we discover new work below, we need to restore m.spinning as a
	// signal for resetspinning to unpark a new worker thread (because
	// there can be more than one starving goroutine).
	//
	// However, if after discovering new work we also observe no idle Ps
	// (either here or in resetspinning), we have a problem. We may be
	// racing with a non-spinning M in the block above, having found no