[Bug remote/26614] AddressSanitizer: heap-use-after-free of extended_remote_target in remote_async_inferior_event_handler

["simark at simark dot ca" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26614

--- Comment #13 from Simon Marchi <simark at simark dot ca> ---
If that's indeed the problem, I can see two solutions:

1. Have some kind of listener that the function can install locally to get
notified if the target gets destroyed, and skip the following code if so.
2. That code exists to re-mark the async event handler if we still have things
to report, because it is automatically cleared by check_async_event_handlers. 
Instead, we can make check_async_event_handlers leave the async event handler
marked and let the target clear it in its ::wait implementation when it no
longer has anything to report.  Or, as a stop-gap solution, have the
remote_async_inferior_event_handler re-mark the handler before calling
inferior_event_handler and clear it in ::wait if there's nothing else to
report.

I have a patch that does that (in the middle of a big work-in-progress series),
as you can see it gets rid of the problematic code:

   https://review.lttng.org/c/binutils-gdb/+/4050/11

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