Teach the test runner whether it's running on a trybot or not

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 142 matching lines @@
                     default="ia32,x64,arm")
   result.add_option("--arch-and-mode",
                     help="Architecture and mode in the format 'arch.mode'",
                     default=None)
   result.add_option("--asan",
                     help="Regard test expectations for ASAN",
                     default=False, action="store_true")
   result.add_option("--buildbot",
                     help="Adapt to path structure used on buildbots",
                     default=False, action="store_true")
+  result.add_option("--dcheck-always-on",
+                    help="Indicates that V8 was compiled with DCHECKs enabled",
+                    default=False, action="store_true")
   result.add_option("--command-prefix",
                     help="Prepended to each shell command used to run a test",
                     default="")
   result.add_option("--coverage", help=("Exponential test coverage "
                     "(range 0.0, 1.0) -- 0.0: one test, 1.0 all tests (slow)"),
                     default=0.4, type="float")
   result.add_option("--coverage-lift", help=("Lifts test coverage for tests "
                     "with a small number of deopt points (range 0, inf)"),
                     default=20, type="int")
   result.add_option("--download-data", help="Download missing test suite data",
@@ skipping 210 matching lines @@
     "deopt_fuzzer": True,
     "gc_stress": False,
     "isolates": options.isolates,
     "mode": mode,
     "no_i18n": False,
     "no_snap": False,
     "simulator": utils.UseSimulator(arch),
     "system": utils.GuessOS(),
     "tsan": False,
     "msan": False,
+    "dcheck_always_on": options.dcheck_always_on,
   }
   all_tests = []
   num_tests = 0
   test_id = 0
 
   # Remember test case prototypes for the fuzzing phase.
   test_backup = dict((s, []) for s in suites)
 
   for s in suites:
     s.ReadStatusFile(variables)
@@ skipping 65 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())