ghc_bignum and ghc_internal are merginge (#576)

Author: shayne-fletcher

CI.hs

@@ -100,7 +100,7 @@ data DaFlavor = DaFlavor
 
 -- Last tested gitlab.haskell.org/ghc/ghc.git at
 current :: String
-current = "bfacc086604c18e30758772a05a8c81e3a4e01bc" -- 2024-12-16
+current = "8b266671bcfe9ef5a25f0a78ea7dcca68b78dc32" -- 2024-12-19
 
 ghcFlavorOpt :: GhcFlavor -> String
 ghcFlavorOpt = \case

ghc-lib-gen/src/Ghclibgen.hs

@@ -321,6 +321,7 @@ calcModuleDeps includeDirs _hsSrcDirs hsSrcIncludes ghcFlavor cabalPackageDb ghc
       ["-clear-package-db -global-package-db -user-package-db -package-db " ++ cabalPackageDb],
       ["-package semaphore-compat" | series >= GHC_9_8],
       ["-fno-safe-haskell" | series >= GHC_9_0], -- avoid warning: [GHC-98887] -XGeneralizedNewtypeDeriving is not allowed in Safe Haskell; ignoring -XGeneralizedNewtypeDeriving
+      ["-DBIGNUM_NATIVE" | series > GHC_9_12],
       includeDirs,
       hsSrcIncludes,
       [placeholderModulesDir </> "Main.hs"]