C++: Accept test changes after frontend update and uncomment test case

The new frontend version does less constant folding.

Author: jketema

cpp/ql/test/library-tests/constants/addresses/addresses.cpp

@@ -26,9 +26,7 @@ void constantAddresses(int param) {
     constexpr int *array2d = &int_arr_arr[1][1] + 1;
     constexpr int *const_ints = &int_arr_arr[int_const][extern_int_const];
 
-    // Commented out because clang and EDG disagree on whether this is
-    // constant.
-    //constexpr int *stmtexpr_int = &int_arr[ ({ 1; }) ];
+    constexpr int *stmtexpr_int = &int_arr[ ({ 1; }) ];
 
     constexpr int *comma_int = &int_arr[ ((void)0, 1) ];
     constexpr int *comma_addr = ((void)0, &int_var);

cpp/ql/test/library-tests/constants/addresses/addresses.expected

@@ -0,0 +1,5 @@
+| addresses.cpp:29:35:29:54 | & ... | stmtexpr_int | misclassified as NOT constant |
+| addresses.cpp:31:32:31:55 | & ... | comma_int | misclassified as NOT constant |
+| addresses.cpp:36:39:36:70 | ... ? ... : ... | ternary_ptr_cond | misclassified as NOT constant |
+| addresses.cpp:37:35:37:69 | & ... | ptr_subtract | misclassified as NOT constant |
+| addresses.cpp:39:35:39:50 | ... + ... | constexpr_va | misclassified as NOT constant |