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amd64: Use ifuncs to select suitable implementation of set_pcb_flags().

Description

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

Details

Provenance
kibAuthored on
Parents
rS339894: Teach procstat -x about the AT_EHDRFLAGS ELF auxiliary vector.
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