[commit: ghc] wip/new-tree-one-param-2's head updated: Udate hsSyn AST to use Trees that Grow (e511e8e)

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Repository : ssh://git@git.haskell.org/ghc

Branch 'wip/new-tree-one-param-2' now includes:

     f011f58 rules: add per-library EXTRA_HC_OPTS
     17055da A bit more tc-tracing
     c2eea08 Make isInsolubleOccursCheck more aggressive
     8dc6d64 Re-engineer Given flatten-skolems
     226860e Shrink a couple of hs-boot files
     ad14efd Some tidying up of type pretty-printing
     19c4203 Typos in comments [ci skip]
     7fce4cb Revert "Rewrite boot in Python"
     c823140 Add regression test for #13758
     27f6f38 Add regression test for #12648
     52fe138 user-guide: Add since annotation for -Wcpp-undef
     db1fd97 template-haskell: Properly escape StrTyLit doc
     2944d27 Fix build after 'Shrink a couple of hs-boot files'
     09d5c99 Fix test output after 'Some tidying up of type pretty-printing'
     3b23f68 Remove HsContext from ppr_mono_ty, and remove ppParendHsType
     e511e8e Udate hsSyn AST to use Trees that Grow