message: [lldb-dotest] Print dotest.py invocation.
  In order to debug a failing python test, you need to debug Python
  instead of the wrapper. For a while I've been adding and removing this,
  but I think it could be useful for everyone.
diff: @@ -13,4 +13,5 @@ if __name__ == '__main__':
  cmd.extend(dotest_args)
  cmd.extend(wrapper_args)
  # Invoke dotest.py and return exit code.
  + print(' '.join(cmd))
  sys.exit(subprocess.call(cmd))
  