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ghc-9.12.1 was released 2024-12-16. this PR adds official support for flavor ghc-9.12.1 (with a new test) and ghc-9.12.1 as a build compiler.
there's a temporary bit of cpp added to CI.hs and Ghclibgen.hs to support build/test with ghc-9.12.1 as a build compiler and the ormolu checks of those files is suspended.