message: [Reproducer] Assert on unexpected packet
  I'm not able to reproduce the reproducer flakiness we're seeing on
  GreenDragon. I want to add this assert to find out if the GDB remote
  packets are somehow getting out of sync when this happens.
diff: @@ -142,6 +142,7 @@ GDBRemoteCommunicationReplayServer::GetPacketAndSendResponse(
  entry.packet.data);
  LLDB_LOG(log, "GDBRemoteCommunicationReplayServer actual packet: '{0}'",
  packet.GetStringRef());
  + assert(false && "Encountered unexpected packet during replay");
  return PacketResult::ErrorSendFailed;
  }
  