C++: Add bool operator to IR test

cpp/ql/test/library-tests/ir/ir/ir.cpp

@@ -2191,6 +2191,7 @@ public:
 
     void set_x(char y) { *x = y; }
     char get_x() { return *x; }
+    operator bool() const;
 };
 
 constexpr bool initialization_with_destructor_bool = true;
@@ -2539,4 +2540,18 @@ void destructor_possibly_not_handled() {
   }
 }
 
+// ClassWithDestructor getClassWithDestructor();
+
+// void this_inconsistency(bool b) {
+//   if (const ClassWithDestructor& a = getClassWithDestructor())
+//     ;
+// }
+
+// constexpr bool initialization_with_destructor_bool = true;
+
+// void constexpr_inconsistency(bool b) {
+//   if constexpr (const ClassWithDestructor& a = getClassWithDestructor(); initialization_with_destructor_bool)
+//     ;
+// }
+
 // semmle-extractor-options: -std=c++20 --clang