added another test case

ir/be/test/bad.c

+unsigned int
+f1 (int diff)
+{
+  return ((unsigned int) (diff < 0 ? -diff : diff));
+}
+
+unsigned int
+f2 (unsigned int diff)
+{
+  return ((unsigned int) ((signed int) diff < 0 ? -diff : diff));
+}
+
+unsigned long long
+f3 (long long diff)
+{
+  return ((unsigned long long) (diff < 0 ? -diff : diff));
+}
+
+unsigned long long
+f4 (unsigned long long diff)
+{
+  return ((unsigned long long) ((signed long long) diff < 0 ? -diff : diff));
+}
+
+main ()
+{
+  int i;
+  for (i = 0; i <= 10; i++)
+    {
+      /*
+      if (f1 (i) != i) {
+        printf("f1(%d)\n", i);
+	abort ();
+      }
+      if (f1 (-i) != i) {
+        printf("f1(%d)\n", -i);
+	abort ();
+      }
+      if (f2 (i) != i) {
+        printf("f2(%d)\n", i);
+	abort ();
+      }
+      */
+      if (f2 (-i) != i) {
+        printf("f2(%d)\n", -i);
+	abort ();
+      }
+      /*
+      if (f3 ((long long) i) != i) {
+        printf("f3(%lld)\n", i);
+	abort ();
+      }
+      if (f3 ((long long) -i) != i) {
+        printf("f3(%lld)\n", -i);
+	abort ();
+      }
+      if (f4 ((long long) i) != i) {
+        printf("f4(%lld)\n", i);
+	abort ();
+      }
+      if (f4 ((long long) -i) != i) {
+        printf("f4(%d)\n", -i);
+	abort ();
+      }
+      */
+    }
+  exit (0);
+}