Use llvm12 instead of llvm9 for ghc 8.10+ #2204
Merged
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Upstream pruned older llvm versions (example: NixOS/nixpkgs#283591). So all version <12 are now unavailable in unstable (soon to be 24.05).
I wasn't sure what to do for GHC version earlier than 8.10, but I feel like 8.10+ is a reasonable compromise for just this PR.