Turn on parallel recompilation for tests that assert optimization status.

test/mjsunit/regress/regress-2315.js

 // Copyright 2012 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 18 matching lines @@
 
 var foo = (function() {
   return eval("(function bar() { return 1; })");
 })();
 
 foo();
 foo();
 %OptimizeFunctionOnNextCall(foo);
 foo();
 
-// Function should be optimized now.
-assertTrue(%GetOptimizationStatus(foo) != 2);
+assertOptimized(foo);