Added more tests

tests/programs/math.q

@@ -0,0 +1,12 @@
+main() {
+	x := 1000
+	syscall(60, div10(x) / 10 + div(x, 100) * 4 - 40 - x + x)
+}
+
+div(x, y) {
+	return x / y
+}
+
+div10(x) {
+	return x / 10
+}