message: Create a marker for Spotlight to never index $BUILD_DIR.
  LLDB queries Spotlight to locate .dSYM bundles based on the UUID
  embedded in a binary, and because the UUID is a hash of filename and
  .text section, there *will* be conflicts inside $BUILD_DIR.
  This should fix the broken green dragon bots.
diff: @@ -1196,8 +1196,17 @@ def run_suite():
  # Set up the working directory.
  # Note that it's not dotest's job to clean this directory.
  - try: os.makedirs(configuration.test_build_dir)
  - except: pass
  + import lldbsuite.test.lldbutil as lldbutil
  + build_dir = configuration.test_build_dir
  + lldbutil.mkdir_p(build_dir)
  +
  + # Create a marker for Spotlight to never index $BUILD_DIR. LLDB
  + # queries Spotlight to locate .dSYM bundles based on the UUID
  + # embedded in a binary, and because the UUID is a hash of filename
  + # and .text section, there *will* be conflicts inside $BUILD_DIR.
  + if platform.system() == "Darwin":
  + with open(os.path.join(build_dir, '.metadata_never_index'), 'w+'):
  + pass
  target_platform = lldb.DBG.GetSelectedPlatform().GetTriple().split('-')[2]
  