ptr add/sub test

[r20886]

ir/be/test/nulladd.c

+#include <stdlib.h>
+#include <stdio.h>
+
+static const int *a = (int *)0x10;
+static const int *b = (int *)0x20;
+
+int main() {
+	printf("%p\n", b - a);
+	return 0;
+}