[Libre-soc-isa] [Bug 996] add shaddsw or replace shadduw with shaddsw since i32 indexes are waay more common than u32

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=996

--- Comment #2 from Jacob Lifshay <programmerjake at gmail.com> ---
in the meeting today, we decided it would probably be best to add shaddsw
instead of replacing shadduw. 

we should probably actually name it shaddw for consistency with the rest of
PowerISA

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