Justin Hibbits cddd0f61e3 Fix PowerPC backtraces. Since kernel and user have completely separate address
spaces, rather than a split address, we actually can't check for being within
the kernel's address range.  Instead, do what other backtraces do, and use
trapexit()/asttrapexit() as the stack sentinel.

MFC after:	3 weeks
2014-09-14 22:03:41 +00:00
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