dialects: (riscv_snitch) add vfmax.s

[superlopuh]

Useful for relu

[superlopuh]

Small refactor, all the result names are now independent of the order so we can move them around, and each of the register operands and results is different so the test keeps track of the order these are printed in.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.83%. Comparing base (04bdfc0) to head (a127953).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2988      +/-   ##
==========================================
- Coverage   89.83%   89.83%   -0.01%     
==========================================
  Files         411      411              
  Lines       51570    51566       -4     
  Branches     8014     8015       +1     
==========================================
- Hits        46327    46323       -4     
  Misses       3963     3963              
  Partials     1280     1280              

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