dialects: (llvm) PyTests for full coverage

[sueszli]

Subset of: #5588

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.24%. Comparing base (af616a9) to head (3ae5d61).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5603      +/-   ##
==========================================
+ Coverage   86.15%   86.24%   +0.09%     
==========================================
  Files         393      394       +1     
  Lines       56308    56390      +82     
  Branches     6492     6496       +4     
==========================================
+ Hits        48513    48636     +123     
+ Misses       6262     6245      -17     
+ Partials     1533     1509      -24     

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