[Issue 19978] D sometimes just crashes on exit with daemon threads

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19978

--- Comment #3 from FeepingCreature <default_357-line at yahoo.de> ---
Okay, got it.

The problem is with a daemon thread, D doesn't join it when shutting down. As a
result, the GC shutdown sequence deletes the thread's memory right under it.

Why do we do this anyway? (gc_term>os_mem_unmap) Why not let the OS handle the
frees?

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