Konstantin Belousov f7f14d9dea When switching IBRS on, also enable STIBP (Single Thread Indirect
Branch Predictors) mitigation.

DOcument 336996-001 promises that CPUs which implement IBRS but not
STIBP silently ignore setting of the bit instead of trapping.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2018-01-31 16:56:02 +00:00
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