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Add LLVM-16 to the Nix builds and CI matrix. Also add the option to explicitly
select an LLVM version so the CircleCI build can still work as before.
We should support at least LLVM-17 currently, but there appears to be a
significant performance regression in compiling the generated code for large
variants that I'm going to debug separately. The long term goal is to support
and test all versions 15 and up.
Test plan: