avg 73eedd1d08 [amd64] dtrace_invop handler is to be called only for kernel exceptions
DTrace-related exceptions in userland code are handled elsewhere.
One practical problem was a crash in dtrace_invop_start() when saved
%rsp pointed to a virtual address that was not backed.

i386 code already ignored userland exceptions.

Reviewed by: markj, kib
MFC after:	2 weeks
Differential Revision: https://reviews.freebsd.org/D5906
2016-04-12 06:46:54 +00:00
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