First test with a locally-built cmt.

[maleadt]

Ideally, I'd like to do the same with the Metal LLVM back-end, but since we can't do an out-of-tree build (i.e. we really have to build most of LLVM, and can't just download the LLVM JLL like LLVM_Extra does) that would probably take too long.

[codecov]

Codecov Report

Merging #30 (f89e200) into main (7c06485) will decrease coverage by 3.67%.
The diff coverage is n/a.

❗ Current head f89e200 differs from pull request most recent head 56f870c. Consider uploading reports for the commit 56f870c to get more accurate results

@@            Coverage Diff             @@
##             main      #30      +/-   ##
==========================================
- Coverage   72.96%   69.28%   -3.68%     
==========================================
  Files          37       37              
  Lines        1169     1169              
==========================================
- Hits          853      810      -43     
- Misses        316      359      +43     

Impacted Files	Coverage Δ
lib/core/error.jl	0.00% <0.00%> (-70.22%)	⬇️
src/utilities.jl	75.86% <0.00%> (-17.25%)	⬇️
lib/core/helpers.jl	35.71% <0.00%> (-7.15%)	⬇️
src/compiler/execution.jl	86.95% <0.00%> (-3.48%)	⬇️

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