Revert "feat: more arithmetic optimizations"

[charles-cooper]

Reverts #2647

[codecov-commenter]

Codecov Report

Merging #2872 (874bbcc) into master (42a372e) will decrease coverage by 0.14%.
The diff coverage is 83.23%.

@@            Coverage Diff             @@
##           master    #2872      +/-   ##
==========================================
- Coverage   87.68%   87.54%   -0.15%     
==========================================
  Files          94       94              
  Lines       10201    10140      -61     
  Branches     2505     2493      -12     
==========================================
- Hits         8945     8877      -68     
- Misses        790      800      +10     
+ Partials      466      463       -3     

Impacted Files	Coverage Δ
vyper/builtin_functions/functions.py	89.23% <ø> (ø)
vyper/exceptions.py	94.49% <ø> (-0.06%)	⬇️
vyper/ir/optimizer.py	80.00% <70.65%> (-11.41%)	⬇️
vyper/ir/compile_ir.py	94.66% <97.87%> (+0.96%)	⬆️
vyper/builtin_functions/convert.py	90.49% <100.00%> (+0.03%)	⬆️
vyper/codegen/core.py	84.55% <100.00%> (-0.30%)	⬇️
vyper/codegen/expr.py	80.73% <100.00%> (ø)
vyper/codegen/ir_node.py	92.83% <100.00%> (+0.02%)	⬆️
vyper/codegen/return_.py	94.87% <100.00%> (ø)
vyper/codegen/stmt.py	88.09% <100.00%> (+0.19%)	⬆️
... and 5 more

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[charles-cooper]

closing in favor of #2868