dialects: (riscv) canonize x ^ x = 0

[mamanain]

Hello! Canonizing this pattern.

Should it be just li 0 instead of it's canonized form in the rewrite pattern? In this case it kind of seems like canonization of li 0 is split to two places.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.91%. Comparing base (56ec030) to head (b0bfc71).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3121   +/-   ##
=======================================
  Coverage   89.91%   89.91%           
=======================================
  Files         425      425           
  Lines       53379    53391   +12     
  Branches     8267     8268    +1     
=======================================
+ Hits        47995    48006   +11     
  Misses       4047     4047           
- Partials     1337     1338    +1     

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[superlopuh]

Perfect, thank you!