[RFA:] CGEN sim operation extension fix; frv adjustment needed.

[Nick Clifton]

Hi Hans-Peter,

> src/cpu:
> 	* frv.cpu (mabshs): Explicitly sign-extend arguments of abs to DI.
> 	(DI-ext-HI, DI-ext-UHI, DI-ext-DI): New pmacros.
> 	(media-arith-sat-semantics): Explicitly sign- or zero-extend
> 	arguments of "operation" to DI using "mode" and the new pmacros.

Approved - please apply.

Cheers
   Nick