vm: uncomment TestForLoopBigIter

It works just fine.

pkg/vm/tests/for_test.go

@@ -357,18 +357,16 @@ func TestDec(t *testing.T) {
 	eval(t, src, big.NewInt(1))
 }
 
-// TODO: This could be a nasty bug. Output of the VM is 65695.
-// Only happens above 100000, could be binary read issue.
-//func TestForLoopBigIter(t *testing.T) {
-//	src := `
-//	package foo
-//		func Main() int {
-//			x := 0
-//			for i := 0; i < 100000; i++ {
-//				x = i
-//			}
-//			return x
-//		}
-//	`
-//	eval(t, src, big.NewInt(99999))
-//}
+func TestForLoopBigIter(t *testing.T) {
+	src := `
+	package foo
+		func Main() int {
+			x := 0
+			for i := 0; i < 100000; i++ {
+				x = i
+			}
+			return x
+		}
+	`
+	eval(t, src, big.NewInt(99999))
+}