[Bug 243534] Kernel panics with "panic: invalid count 2" early during boot

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243534

--- Comment #2 from commit-hook at freebsd.org ---
A commit references this bug:

Author: emaste
Date: Thu Jan 23 14:11:03 UTC 2020
New revision: 357045
URL: https://svnweb.freebsd.org/changeset/base/357045

Log:
  Apply r355819 to sparc64 - fix assertion failure after r355784

  From r355819:
  Repeat the spinlock_enter/exit pattern from amd64 on other architectures
  to fix an assert violation introduced in r355784.  Without this
  spinlock_exit() may see owepreempt and switch before reducing the
  spinlock count.  amd64 had been optimized to do a single critical
  enter/exit regardless of the number of spinlocks which avoided the
  problem and this optimization had not been applied elsewhere.

  This is completely untested - I have no obsolete Sparc hardware - but
  someone did try testing recent changes on sparc64 (PR 243534).

  PR:           243534

Changes:
  head/sys/sparc64/sparc64/machdep.c

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