feat[venom]: common subexpression elimination pass

[HodanPlodky]

What I did

Created common subexpression elimination pass

How I did it

Created available expression analysis and common subexpressions elimination pass. The available expression analysis is done with consideration to effects which heavy inspired by multidimensional fencing.

How to verify it

Created tests

Commit message

feat[venom]: common subexpression elimination

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[charles-cooper]

looks like this can be IROperand | _Expression

[codecov]

Codecov Report

Attention: Patch coverage is 27.35426% with 162 lines in your changes missing coverage. Please review.

Project coverage is 45.91%. Comparing base (e21f3e8) to head (a3585ed).

Files with missing lines	Patch %	Lines
vyper/venom/analysis/available_expression.py	28.65%	117 Missing ⚠️
...r/venom/passes/common_subexpression_elimination.py	23.21%	43 Missing ⚠️
vyper/venom/__init__.py	50.00%	1 Missing ⚠️
vyper/venom/passes/dft.py	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (e21f3e8) and HEAD (a3585ed). Click for more details.

HEAD has 138 uploads less than BASE

Flag	BASE (e21f3e8)	HEAD (a3585ed)
	139	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4241       +/-   ##
===========================================
- Coverage   91.36%   45.91%   -45.45%     
===========================================
  Files         108      110        +2     
  Lines       15637    15859      +222     
  Branches     3440     3496       +56     
===========================================
- Hits        14287     7282     -7005     
- Misses        920     8024     +7104     
- Partials      430      553      +123     

Flag	Coverage Δ
	45.91% <27.35%> (-45.34%)	⬇️

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