Pre-Pre-HFTP: Decoupling base and GHC

[atravers]

Bringing Data.Text into `base`: What is the next step?

Draft: move base to ghc base, #20647 (!7898) · Merge requests · Glasgow Haskell Compiler / GHC · GitLab this is a very simple PR which almost works. Some just needs to debug the remaining Safe Haskell and TH test failures; I would love it if that someone were not me. After that is done I think splitting base up can proceed incrementally with assorted volunteer effort. This is the one and only stumbling block!