[Issue 21066] Druntime SIGSEGV / SIGBUS unittest signal handler should emit the stack trace for all threads

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21066

--- Comment #2 from FeepingCreature <default_357-line at yahoo.de> ---
Readable version:

> A signal may be process-directed or thread-directed. [...]
> A thread-directed signal is one that is targeted at a specific thread. A signal may be
> thread-directed because it was generated as a consequence of executing a specific
> A machine-language instruction that triggered a hardware exception (e.g., SIGSEGV for
> an invalid memory access, or SIGFPE for a math error)

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