[mips patch] fix annoyances w/ ror/rol/dror/drol implementation.

[cgd@broadcom.com]

> There are several annoyances with the current MIPS assembler
> implementation of ror, rol, dror, and drol:
> [...]

Actually, reading that patch over one last time, i notice one issue in
the new code: immediate drol/dror counts > 64 still aren't being
handled properly.

I'll gen up a new patch, add some more tests, and send it off soon.

other than that, though, does this look ok?


(gah, always find a problem in the read-over of the patch sent to the
list...  8-)


chris