Let test runner rerun failures to test for flakes.

tools/run-deopt-fuzzer.py

 #!/usr/bin/env python
 #
 # 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
@@ skipping 353 matching lines @@
       timeout = TIMEOUT_DEFAULT;
 
   timeout *= TIMEOUT_SCALEFACTOR[mode]
   ctx = context.Context(arch, mode, shell_dir,
                         mode_flags, options.verbose,
                         timeout, options.isolates,
                         options.command_prefix,
                         options.extra_flags,
                         False,
                         options.random_seed,
-                        True)
+                        True,
+                        0,

[Jakob Kummerow, 2014/07/02 07:27:26]

nit: may want to add a comment what the False/True/0/0 lines are specifying

[Michael Achenbach, 2014/07/02 08:06:32]

Done.

+                        0)
 
   # Find available test suites and read test cases from them.
   variables = {
     "arch": arch,
     "asan": options.asan,
     "deopt_fuzzer": True,
     "gc_stress": False,
     "isolates": options.isolates,
     "mode": mode,
     "no_i18n": False,
@@ skipping 78 matching lines @@
   print(">>> Deopt fuzzing phase (%d test cases)" % num_tests)
   progress_indicator = progress.PROGRESS_INDICATORS[options.progress]()
   runner = execution.Runner(suites, progress_indicator, ctx)
 
   code = runner.Run(options.j)
   return exit_code or code
 
 
 if __name__ == "__main__":
   sys.exit(Main())