[lldb-dev] Process::SyncIOHandler(), everyone please try out the following patch

[Pavel Labath]

Hello everyone,

I have made a new patch to attempt to solve this issue. It is
basically a combination of two of the approaches posted here by Greg:
fix SyncIOHandler so it doesn't hang and pipe all asynchronous output
through the current IOHandler. I have added some synchronization there
to avoid some of the races I have found. Could you please test it
again and see if it works for you.

regards,
pl