Add test for '/', '<<', and '>>' in #if expressions.

These operators have been supported already, but were not covered in
existing tests yet. So this test passes already.

tests/053-if-divide-and-shift.c

@@ -0,0 +1,16 @@
+#if (15 / 2) != 7
+failure_1
+#else
+success_1
+#endif
+#if (1 << 12) == 4096
+success_2
+#else
+failure_2
+#endif
+#if (31762 >> 8) != 124
+failure_3
+#else
+success_3
+#endif
+