Optimize functions on a second thread.

test/mjsunit/debug-script.js

 // Copyright 2008 the V8 project authors. All rights reserved.
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 // 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
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 //       with the distribution.
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 //       from this software without specific prior written permission.
 //
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-// Flags: --expose-debug-as debug --expose-gc
+// Flags: --expose-debug-as debug --expose-gc  --noparallel-recompilation
 // Get the Debug object exposed from the debug context global object.
 Debug = debug.Debug
 
 Date();
 RegExp();
 
 // Count script types.
 var named_native_count = 0;
 var named_native_names = {};
 var extension_count = 0;
@@ skipping 50 matching lines @@
 }
 
 // Test a normal script.
 var mjsunit_js_script = Debug.findScript(/mjsunit.js/);
 assertTrue(/mjsunit.js/.test(mjsunit_js_script.name));
 assertEquals(Debug.ScriptType.Normal, mjsunit_js_script.type);
 
 // Check a nonexistent script.
 var dummy_script = Debug.findScript('dummy.js');
 assertTrue(typeof dummy_script == 'undefined');