Remove core loading timeout

[labath]

Summary

If target.preload-symbols is false, waiting for the process to "stop"
can take an arbitrarily long amount of time, because it will cause all
the debug info to be parsed (to compute the stop message showing the
function, its arguments, etc).

We were previously waiting for 10 seconds for the stop even to arrive,
which is a pretty long time, but it's not that hard to overcome with
huge debug info.

Since any arbitrary limit can be theoretically overcome with huge
debug_info and/or slow machine, and the stop even was sent 3 lines above
the wait, if we ever do not receive the stop even means we've got a bug
in lldb. Therefore, I remove the timeout on this wait completely.

No test because I don't know how to reproduce this without a
multi-gigabyte symbol file.

source/Target/Process.cpp

if (error.Success()) {
 
     // We successfully loaded a core file, now pretend we stopped so we can
     // show all of the threads in the core file and explore the crashed state.
     SetPrivateState(eStateStopped);
 
     // Wait for a stopped event since we just posted one above...
     lldb::EventSP event_sp;
     StateType state =
-        WaitForProcessToStop(seconds(10), &event_sp, true, listener_sp);
+        WaitForProcessToStop(llvm::None, &event_sp, true, listener_sp);
 
     if (!StateIsStoppedState(state, false)) {
       Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_PROCESS));
       if (log)
         log->Printf("Process::Halt() failed to stop, state is: %s",
                     StateAsCString(state));
       error.SetErrorString(
           "Did not get stopped event after loading the core file.");