posix: restore original SEGV signal handler upon first entry of our handler #12099
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The current SEGV handling on posix is not useful: as soon as our handler is left, it's triggered again, infinitely.
This patch changes to restore the original handler, so the OS can create a core dump, etc.
I'm also ok with removing our custom handler altogether, since the stack trace addresses are not resolved to function names, and therefore not very useful.