o1vm/riscv32: implement mulh

[dannywillems]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 71.95%. Comparing base (e0c1e89) to head (83aec4b).

Files with missing lines	Patch %	Lines
o1vm/src/interpreters/riscv32im/interpreter.rs	0.00%	11 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                   @@
##           dw/riscv32/impl-mul    #2795      +/-   ##
=======================================================
+ Coverage                71.93%   71.95%   +0.02%     
=======================================================
  Files                      255      255              
  Lines                    60019    60009      -10     
=======================================================
+ Hits                     43175    43180       +5     
+ Misses                   16844    16829      -15     

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