C++: Add test cases.

Author: geoffw0

cpp/ql/test/query-tests/Likely Bugs/Arithmetic/PointlessComparison/PointlessComparison.c

@@ -363,4 +363,22 @@ int callCommand(void)
   if (tmp == 1)  // tmp could have been modified by the call.
     return 1;
   return 0;
-}
+}
+
+int shifts(void)
+{
+	unsigned int x = 3;
+
+	if (x >> 1 >= 1) {} // always true [BAD MESSAGE]
+	if (x >> 1 >= 2) {} // always false [BAD MESSAGE]
+	if (x >> 1 == 1) {} // always true [INCORRECT MESSAGE]
+}
+
+int bitwise_ands()
+{
+	unsigned int x = 0xFF;
+
+	if ((x & 2) >= 1) {}
+	if ((x & 2) >= 2) {}
+	if ((x & 2) >= 3) {} // always false
+}

cpp/ql/test/query-tests/Likely Bugs/Arithmetic/PointlessComparison/PointlessComparison.expected

@@ -38,5 +38,9 @@
 | PointlessComparison.c:303:9:303:14 | ... >= ... | Comparison is always false because c <= 0. |
 | PointlessComparison.c:312:9:312:14 | ... >= ... | Comparison is always false because c <= 0. |
 | PointlessComparison.c:337:14:337:21 | ... >= ... | Comparison is always true because x >= 0. |
+| PointlessComparison.c:372:6:372:16 | ... >= ... | Comparison is always true because ... >> ... >= 1.5. |
+| PointlessComparison.c:373:6:373:16 | ... >= ... | Comparison is always false because ... >> ... <= 1.5. |
+| PointlessComparison.c:374:6:374:16 | ... == ... | Comparison is always false because ... >> ... >= 1.5. |
+| PointlessComparison.c:383:6:383:17 | ... >= ... | Comparison is always false because ... & ... <= 2. |
 | RegressionTests.cpp:57:7:57:22 | ... <= ... | Comparison is always true because * ... <= 4294967295. |
 | Templates.cpp:9:10:9:24 | ... <= ... | Comparison is always true because local <= 32767. |