Commit aa79f65c authored by Ryan Scott's avatar Ryan Scott Committed by Marge Bot

Bump ghc version to 8.9

Along the way, I discovered that `template-haskell.cabal` was
hard-coding the GHC version (in the form of its `ghc-boot-th` version
bounds), so I decided to make life a little simpler in the future by
generating `template-haskell.cabal` with autoconf.
parent eda456f6
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