[PATCH 1/7] Merge async and sync code paths some more

[Joel Brobecker]

> I'm trying to build a Windows gdb to see this in
> action.  Many thanks for the detailed analysis!

Thanks Pedro. Let me know if I can help, I don't mind doing the
leg-work! It's just that I needed a bit of guidance because I don't
have the whole picture on how the mainloop is supposed to work,
particulary with the async-vs-non-async, all-stop-vs-non-stop,
etc.

-- 
Joel