[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 #11 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #10)
> wondering if it should
> have been matched up with itype.

I matched it to shadd[uw]:
| NN | RT | RA  | RB  | sm0| sm1 1 | 0101 110 |Rc| shaddw    | X-Form  |
| NN | RT | RA  | RB  | sm0| sm1 0 | 1101 110 |Rc| shadd     | X-Form  |
| NN | RT | RA  | RB  | sm0| sm1 1 | 1101 110 |Rc| shadduw   | X-Form  |

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