[test] Make test duplication more robust

tools/testrunner/local/testsuite.py

 # 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 161 matching lines @@
       pass_fail = False
       testname = self.CommonTestName(t)
       variant = t.variant or ""
       if variants:
         rules = self.rules[variant]
         wildcards = self.wildcards[variant]
       if testname in rules:
         used_rules.add((testname, variant))
         # Even for skipped tests, as the TestCase object stays around and
         # PrintReport() uses it.
-        t.outcomes |= rules[testname]
+        t.outcomes = t.outcomes | rules[testname]
         if statusfile.DoSkip(t.outcomes):
           continue  # Don't add skipped tests to |filtered|.
         for outcome in t.outcomes:
           if outcome.startswith('Flags: '):
             t.flags += outcome[7:].split()
         slow = statusfile.IsSlow(t.outcomes)
         pass_fail = statusfile.IsPassOrFail(t.outcomes)
       skip = False
       for rule in wildcards:
         assert rule[-1] == '*'
         if testname.startswith(rule[:-1]):
           used_rules.add((rule, variant))
-          t.outcomes |= wildcards[rule]
+          t.outcomes = t.outcomes | wildcards[rule]
           if statusfile.DoSkip(t.outcomes):
             skip = True
             break  # "for rule in wildcards"
           slow = slow or statusfile.IsSlow(t.outcomes)
           pass_fail = pass_fail or statusfile.IsPassOrFail(t.outcomes)
       if (skip
           or self._FilterSlow(slow, slow_tests)
           or self._FilterPassFail(pass_fail, pass_fail_tests)):
         continue  # "for t in self.tests"
       filtered.append(t)
@@ skipping 137 matching lines @@
     return (testcase.flags + ["--gtest_filter=" + testcase.path] +
             ["--gtest_random_seed=%s" % context.random_seed] +
             ["--gtest_print_time=0"] +
             context.mode_flags)
 
   def _VariantGeneratorFactory(self):
     return StandardVariantGenerator
 
   def shell(self):
     return self.name