Update IR for equations

[HarrisonGrodin]

No description provided.

[codecov]

Codecov Report

Merging #80 into master will decrease coverage by 0.34%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master      #80      +/-   ##
==========================================
- Coverage    89.7%   89.35%   -0.35%     
==========================================
  Files          11       12       +1     
  Lines         408      404       -4     
==========================================
- Hits          366      361       -5     
- Misses         42       43       +1

Impacted Files	Coverage Δ
src/ModelingToolkit.jl	75% <ø> (ø)	⬆️
src/variables.jl	76.56% <ø> (-1.35%)	⬇️
src/operations.jl	68.42% <100%> (ø)	⬆️
src/function_registration.jl	100% <100%> (ø)	⬆️
src/systems/diffeqs/first_order_transform.jl	100% <100%> (ø)	⬆️
src/systems/nonlinear/nonlinear_system.jl	100% <100%> (ø)	⬆️
src/utils.jl	92.59% <100%> (+0.92%)	⬆️
src/equations.jl	81.48% <81.48%> (ø)
src/systems/diffeqs/diffeqsystem.jl	89.47% <88.46%> (-0.78%)	⬇️

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