[PATCH] Add panic tapset

[Bryn M. Reeves]

Hi Folks,

This patch adds a tapset with a single function to call the native
panic() routine. This is useful in order to trigger a core dump to
collect post-mortem debugging data when some condition occurs.

I've used this sort of trick several times (e.g. the PanicOnOom war
story in the systemtap wiki) and find it a very handy tool.

E.g.:

stap -g -e 'probe end { panic("whoops!") }'

Regards,
Bryn.
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