Konstantin Belousov 9775a6ebd2 amd64: Use ifuncs to select suitable implementation of set_pcb_flags().
There is no reason to check for PCB_FULL_IRET if FSGSBASE instructions
are not supported.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2018-10-29 23:52:31 +00:00
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