Previously we rejected all entries from Loader.so even if the faulting
address was located in it, i.e. the actual issue was with the dynamic
loader. We no longer do that to make debugging Loader crashes easier.
Some coredumps take a long time to symbolicate, so let's show a simple
window with a progress bar while they are loading.
I'm not super happy with the factoring of this feature, but it's an
absolutely kickass feature that makes crashing feel 100% more responsive
than before, since you now get GUI feedback almost immediately after a
crash occurs. :^)
