Ensure tcg_env is up-to-date when running typechecker plugins
While making Haddock's interface creation a typechecker plugin I noticed that GHC doesn't have the most up-to-date tcg_env in the TcM environment when running plugins. This MR fixes that.
Currently as a workaround I am using setGblEnv
in the plugin but it would be nice if GHC did the right thing in the first place.
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