Commits on May 12, 2024

1. Refactor MUL instruction …

   This instruction had a bit of a case of 'boolean blindness' code smell,
   where the mul operation was represented as a triple of booleans. This
   commit refactors the implemention to use a struct with named fields for
   high, signed_rs1, and signed_rs2.
   
   The C_MUL instruction in Zcb also needs to be changed appropriately
   
   The mul_op struct was added in riscv_types
   
   While there do some housekeeping w.r.t the comment about a workaround for
   Sail < 0.15.1, as this is no longer needed.

   

   Alasdair committed May 12, 2024
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