fix ie8 mangling of top-level AST_SymbolCatch (#2263)

fixes #2254

lib/scope.js

@@ -235,6 +235,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
                     ref.reference(options);
                 });
                 node.thedef = def;
+                node.reference(options);
                 return true;
             }
         }));