Revert "C++: Accept test changes."

This reverts commit f36b48346e.

cpp/ql/test/library-tests/ir/range-analysis/SimpleRangeAnalysis_tests.cpp

@@ -1014,7 +1014,7 @@ void test_overflow() {
   if ((x + y) <= 512) {
     range(x); // $ range===2147483647
     range(y); // $ range===256
-    range(x + y); // $ range=<=2147483903 overflow=+
+    range(x + y); // $ range===-2147483393
   }
 }