[Bug 237968] 12-STABLE: MDS software mitigation locks up on Haswell

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237968

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

Author: kib
Date: Tue May 21 22:56:22 UTC 2019
New revision: 348075
URL: https://svnweb.freebsd.org/changeset/base/348075

Log:
  Do not call hw_mds_recalculate() from initializecpu().

  If MDS mitigation is enabled by the tunable but MDS microcode is not
  early-loaded, software mitigation is selected.  This causes
  initializecpu() to try to allocate memory which makes boot process
  very unhappy.

  Create SYSINIT that runs sufficiently late to succeed.

  Reported by:  naddy
  PR:   237968
  Sponsored by: The FreeBSD Foundation
  MFC after:    1 week

Changes:
  head/sys/amd64/amd64/initcpu.c
  head/sys/i386/i386/initcpu.c
  head/sys/x86/x86/cpu_machdep.c

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