feat[venom]: make dft-pass commutative aware

[charles-cooper]

use the "choice" heuristic for commutative instructions

refactor/misc:
some small code cleanup in dft pass

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[codecov]

Codecov Report

Attention: Patch coverage is 21.05263% with 15 lines in your changes missing coverage. Please review.

Project coverage is 45.94%. Comparing base (c32b9b4) to head (1ebc876).

Files with missing lines	Patch %	Lines
vyper/venom/passes/dft.py	0.00%	9 Missing ⚠️
vyper/venom/basicblock.py	40.00%	6 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (c32b9b4) and HEAD (1ebc876). Click for more details.

HEAD has 139 uploads less than BASE

Flag	BASE (c32b9b4)	HEAD (1ebc876)
	140	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4358       +/-   ##
===========================================
- Coverage   91.23%   45.94%   -45.30%     
===========================================
  Files         112      112               
  Lines       16010    16015        +5     
  Branches     2697     2699        +2     
===========================================
- Hits        14607     7358     -7249     
- Misses        968     8097     +7129     
- Partials      435      560      +125     

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