get_cycles/get_tbl on 405

[andrew may]

I wanted to do some quick time measurements of some things on a driver
running of the 405GP and I eneded up using get_tbl(). It seems like
get_cycles should be the more standard way to get a tick count but
it seems to return 0. I don't get the __ftr_fixup stuff in timex.h
so I am not sure what it is trying to do differently from get_tbl.


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