Implemented move with sign extension

tests/programs/negation.q

@@ -1,5 +1,5 @@
 main() {
-	syscall(60, f(-32))
+	assert f(-32) == 32
 }
 
 f(x) {

tests/programs/negative.q

@@ -1,5 +1,5 @@
 main() {
 	a := -32
 	b := 64
-	syscall(60, a + b)
+	assert a + b == 32
 }

tests/programs_test.go

@@ -31,8 +31,8 @@ var programs = []struct {
 	{"modulo", "", "", 0},
 	{"modulo-assign", "", "", 0},
 	{"division-split", "", "", 0},
-	{"negative", "", "", 32},
-	{"negation", "", "", 32},
+	{"negative", "", "", 0},
+	{"negation", "", "", 0},
 	{"square-sum", "", "", 0},
 	{"chained-calls", "", "", 0},
 	{"nested-calls", "", "", 0},