[tests] add test for monitoring usage of local var in declaration of another

tests/syntax/local-variable.i

@@ -11,5 +11,11 @@ void f() {
   }
 }
 
+void h (int i) {
+ int x = 1;
+ int t[100 / sizeof(x)];
+ int u[100 / sizeof(i)];
+}
+
 int c;
 int g() { return 1 || (-1L || g(), c); }