constant_propagation_test.irl

function foo, 1
	arg a
	c = 3
	y = 7
	z = 3
	if (a > 2) goto start
	x = y+z
	z = c*c
	goto end
	label start
		c = c+c
		x = y-z
		// goto end
	label end
		a = c*c
		ret a