Minor cleanup

[Warner Losh]

Greetings,

Looking for someone to review this minor cleanup on mips. I've moved a few little things from asm.h, where they don't belong, into pcb.h where they do. I've also moved a little duplication out of swtch.S and exception.S into pcb.h.

http://people.freebsd.org/~imp/mips-1.diff

Warner

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