Increase timeout when running test.py with the --stress-opt option.

tools/test.py

 #!/usr/bin/env python
 #
 # Copyright 2008 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
@@ skipping 693 matching lines @@
 
   def GetVmFlags(self, testcase, mode):
     flags = testcase.GetCustomFlags(mode)
     if flags is None:
       flags = FLAGS[mode]
     return testcase.variant_flags + flags
 
   def GetTimeout(self, testcase, mode):
     result = self.timeout * TIMEOUT_SCALEFACTOR[mode]
     if '--stress-opt' in self.GetVmFlags(testcase, mode):
-      return result * 2
+      return result * 4
     else:
       return result
 
 def RunTestCases(cases_to_run, progress, tasks):
   progress = PROGRESS_INDICATORS[progress](cases_to_run)
   result = 0
   try:
     result = progress.Run(tasks)
   except Exception, e:
     print "\n", e
@@ skipping 807 matching lines @@
     for entry in timed_tests[:20]:
       t = FormatTime(entry.duration)
       sys.stderr.write("%4i (%s) %s\n" % (index, t, entry.GetLabel()))
       index += 1
 
   return result
 
 
 if __name__ == '__main__':
   sys.exit(Main())