test for CSE moving flags into different block

[r15832]

ir/be/test/fehler78.c

+/*$ -fno-inline $*/
+#include <stdio.h>
+
+int k;
+
+int f(int a)
+{
+	if(k < 20) {
+		rand();
+		return a < 5 ? 10 : 20;
+	} else {
+		return a < 5 ? 20 : 0;
+	}
+}
+
+int main(void)
+{
+	k = 21;
+	printf("Res: %d should be 0\n", f(20));
+	return 0;
+}