nv60: Add prmt modifiers.
nv60: Add prmt modifiers.

Also NFI what they do.

Now if only I could figure out the proper modifiers for other
undocumented insns that ptxas accepts...

 $ cat `which ptxas`
 #!/bin/sh
 while read x
 do
 	echo Arguments mismatch for instruction 'x'
 done

Or something like that.

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