[Bug 218452] I can cause an assertion with a dtrace script and when it does happen, dtrace fails until the module dtraceall is reloaded

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218452

--- Comment #9 from commit-hook at freebsd.org ---
A commit references this bug:

Author: markj
Date: Mon Dec 18 17:26:25 UTC 2017
New revision: 326935
URL: https://svnweb.freebsd.org/changeset/base/326935

Log:
  Avoid CPU migration in dtrace_gethrtime() on x86.

  dtrace_gethrtime() may be called outside of probe context, and in
  particular, from the DTRACEIOC_BUFSNAP handler.

  Disable interrupts rather than using sched_pin() to help ensure that
  we don't call any external functions when in probe context.

  PR:           218452
  MFC after:    1 week

Changes:
  head/sys/cddl/dev/dtrace/amd64/dtrace_subr.c
  head/sys/cddl/dev/dtrace/i386/dtrace_subr.c

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