message: Remove stderr message from GDBRemoteCommunicationServerLLGS
  A similar error message is printed again in lldb-gdbserver.cpp, so the
  user will see the message twice. Also, this is generic library code, we
  shouldn't really be using stderr here.
diff: @@ -244,13 +244,8 @@ Status GDBRemoteCommunicationServerLLGS::LaunchProcess() {
  "process but one already exists");
  auto process_or =
  m_process_factory.Launch(m_process_launch_info, *this, m_mainloop);
  - if (!process_or) {
  - Status status(process_or.takeError());
  - llvm::errs() << llvm::formatv(
  - "failed to launch executable `{0}`: {1}",
  - m_process_launch_info.GetArguments().GetArgumentAtIndex(0), status);
  - return status;
  - }
  + if (!process_or)
  + return Status(process_or.takeError());
  m_debugged_process_up = std::move(*process_or);
  }
  