During kernel state rewrite, handle functions passed as arguments.

[maleadt]

Fixes JuliaGPU/CUDA.jl#1971.

[codecov]

Codecov Report

Patch coverage: 90.90% and project coverage change: +0.02 🎉

Comparison is base (ef5e40f) 82.49% compared to head (d731d79) 82.52%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #474      +/-   ##
==========================================
+ Coverage   82.49%   82.52%   +0.02%     
==========================================
  Files          23       23              
  Lines        3085     3096      +11     
==========================================
+ Hits         2545     2555      +10     
- Misses        540      541       +1     

Impacted Files	Coverage Δ
src/irgen.jl	93.49% <90.90%> (-0.06%)	⬇️

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