Dump siginfo and signal to be delivered when we get an unexpected sig…

…nal while trying to enter a user signal handler

src/RecordSession.cc

@@ -1543,7 +1543,8 @@ static bool inject_handled_signal(RecordTask* t) {
 
  // We stepped into a user signal handler.
  ASSERT(t, t->stop_sig() == SIGTRAP)
- << "Got unexpected status " << t->status();
+ << "Got unexpected status " << t->status() << " trying to deliver " << sig
+ << " siginfo is " << t->get_siginfo();
  ASSERT(t, t->get_signal_user_handler(sig) == t->ip())
  << "Expected handler IP " << t->get_signal_user_handler(sig) << ", got "
  << t->ip()