[Bug 230985] pmcstat triggers assertion "pmcval outside of expected range"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230985

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: mmacy
Date: Fri Sep 14 01:30:06 UTC 2018
New revision: 338677
URL: https://svnweb.freebsd.org/changeset/base/338677

Log:
  hwpmc: set default rate if event description lacks one / filter rate against
misuse

  Not all event descriptions have a sample rate (such as inst_retired.any)
  this will restore the legacy behavior of using 65536 in that case. It also
  prevents accidental API misuse that could lead to panic.

  PR:   230985
  Reported by:  markj
  Reviewed by:  markj
  Approved by:  re (gjb)
  Sponsored by: Limelight Networks
  Differential Revision:        https://reviews.freebsd.org/D16958

Changes:
  head/lib/libpmc/libpmc_pmu_util.c
  head/sys/dev/hwpmc/hwpmc_mod.c

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