Add an --msan flag to run-tests.py.

tools/run-tests.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 239 matching lines @@
   result.add_option("--valgrind", help="Run tests through valgrind",
                     default=False, action="store_true")
   result.add_option("--warn-unused", help="Report unused rules",
                     default=False, action="store_true")
   result.add_option("--junitout", help="File name of the JUnit output")
   result.add_option("--junittestsuite",
                     help="The testsuite name in the JUnit output file",
                     default="v8tests")
   result.add_option("--random-seed", default=0, dest="random_seed",
                     help="Default seed for initializing random generator")
+  result.add_option("--msan",
+                    help="Regard test expectations for MSAN",
+                    default=False, action="store_true")
   return result
 
 
 def ProcessOptions(options):
   global VARIANT_FLAGS
   global VARIANTS
 
   # Architecture and mode related stuff.
   if options.arch_and_mode:
     options.arch_and_mode = [arch_and_mode.split(".")
@@ skipping 232 matching lines @@
     "deopt_fuzzer": False,
     "gc_stress": options.gc_stress,
     "isolates": options.isolates,
     "mode": mode,
     "no_i18n": options.no_i18n,
     "no_snap": options.no_snap,
     "simulator_run": simulator_run,
     "simulator": utils.UseSimulator(arch),
     "system": utils.GuessOS(),
     "tsan": options.tsan,
+    "msan": options.msan,
   }
   all_tests = []
   num_tests = 0
   test_id = 0
   for s in suites:
     s.ReadStatusFile(variables)
     s.ReadTestCases(ctx)
     if len(args) > 0:
       s.FilterTestCasesByArgs(args)
     all_tests += s.tests
@@ skipping 60 matching lines @@
   exit_code = runner.Run(options.j)
   overall_duration = time.time() - start_time
 
   if options.time:
     verbose.PrintTestDurations(suites, overall_duration)
   return exit_code
 
 
 if __name__ == "__main__":
   sys.exit(Main())