C++: Add another cpp/constant-comparison FP test case

Author: jketema

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

@@ -50,4 +50,5 @@
 | PointlessComparison.cpp:43:6:43:29 | ... >= ... | Comparison is always true because ... >> ... >= 140737488355327.5. |
 | PointlessComparison.cpp:44:6:44:28 | ... >= ... | Comparison is always true because ... >> ... >= 140737488355327.5. |
 | RegressionTests.cpp:57:7:57:22 | ... <= ... | Comparison is always true because * ... <= 4294967295. |
+| RegressionTests.cpp:165:9:165:33 | ... > ... | Comparison is always true because ... * ... >= 64. |
 | Templates.cpp:9:10:9:24 | ... <= ... | Comparison is always true because local <= 32767. |

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

@@ -155,3 +155,12 @@ struct someType {
 };
 
 someType<42>::b someType_x;
+
+struct A_Struct {
+  int x;
+  int y;
+};
+
+enum E {
+  E_e = sizeof(A_Struct) * 8 > 50 // GOOD [FALSE POSITIVE]
+};