Upgrade underlying GHC to 8f021b8c474f328441982c90c6a12f716b5607eb #6
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I've started work on rebasing to GHC 9.0.1. For now, https://gitlab.haskell.org/ghc/ghc/-/issues/20012 blocks that effort. At the very least, this PR straddles some of the big GHC refactorings that happened in the meantime.