[testing] Move the last JS tests out of "preparser".

test/message/symbols-only.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 28 matching lines @@
   throw y;
   y = 4;
 } catch (e) {
   y = e;
 } finally {
   x = y;
 }
 for (var i = 0; i < 10; i++) {
   x += x;
 }
-print(y);