C++: Add 'range(x)' call demonstrating missing bounds.

Author: MathiasVP

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

@@ -119,6 +119,7 @@ int test9(int x, int y) {
     }
     range(x); // $ range=>=4
   }
+  range(x); // $ MISSING: range=>=4
   return x;
 }