FreeBSD/src a7b87a2 (r345468)sys/amd64/linux linux_machdep.c

Revert r313993.
AMD64_SET_**BASE expects a pointer to a pointer, we just passing in the pointer value itself.

Set PCB_FULL_IRET for doreti to restore %fs, %gs and its correspondig base.

PR:             225105
Reported by:    trasz@
MFC after:      1 month
DeltaFile
+18-15sys/amd64/linux/linux_machdep.c
+18-151 files

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