kib 2c234bfed6 Update some comments related to use of amd64 full context switch.
In exec_linux_setregs(), use locally cached pointer to pcb to set
pcb_full_iret.
In set_regs(), note that full return is needed when code that sets
segment registers is enabled.

MFC after:	1 week
2010-12-07 12:44:33 +00:00
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2010-10-08 07:19:05 +00:00
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