Adapt to LLVM.jl clean-up.

[maleadt]

JuliaLLVM/LLVM.jl#194

[codecov]

Codecov Report

Merging #52 into master will decrease coverage by 0.40%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #52      +/-   ##
==========================================
- Coverage   60.53%   60.13%   -0.41%     
==========================================
  Files          28       28              
  Lines        1495     1495              
==========================================
- Hits          905      899       -6     
- Misses        590      596       +6     

Impacted Files	Coverage Δ
src/optim.jl	98.50% <ø> (ø)
src/reflection.jl	6.49% <ø> (ø)
src/debug.jl	91.66% <100.00%> (ø)
src/driver.jl	60.74% <100.00%> (-8.42%)	⬇️
src/mcgen.jl	100.00% <100.00%> (+9.09%)	⬆️
src/utils.jl	23.07% <100.00%> (ø)
src/validation.jl	90.15% <100.00%> (ø)

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