[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 #12 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
hum hum should add+1 be included?

(or, more like 1<<sm)

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