[commit: ghc] wip/T8584's head updated: Update Haddock to new pattern synonym type signature syntax (e199b05)

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

Branch 'wip/T8584' now includes:

     fa75309 Update .mailmap
     452d6aa Partially revert 475dd93efa
     e14a973 Generalize exposed-modules field in installed package database
     1854825 Workaround 452d6aa95b7 breaking TrustworthySafe03
     609cd28 Update to (unreleased) `deepseq-1.4.0.0`
     c45e2e2 Fix compilation of `integer-gmp2` with `-O0`
     a2c0a8d Update validate settings now that containers and process have been updated to handle `-fwarn-trustworthy-safe`.
     2a6f193 Fix a bug introduced with allocation counters
     0515055 document addDependentFile uses contents, not mtime
     d997ca8 Don't use absolute paths for perl in validate
     a520761 Remove outdated TODO in TimeManager
     bc68ed0 Make listArray fuse
     df22507 Docs only
     ce2cc64 Adding dedicated Show instances for SrcSpan/SrcLoc
     74a6a8a Change a comment referring falsely to seq
     44f1582 Remove optimized package lookup, simplifying code.
     b9096df Add a note why tcGetInstEnvs is duplicated.
     aa1c1b2 Build xhtml and haddock only when `HADDOCK_DOCS=YES`
     9a20379 Fix ffi023
     20226c2 Whitespace only
     ac1281f Outputable instance for IfaceVectInfo
     535644f Add missing semicolon in Schedule.c
     1f6b1ab base: Fix (**) instance for Data.Complex (#8539)
     ddb484c Update comment about C helper for foreign exports (#9713)
     87cd37b Fix usage of `find -perm` in aclocal.m4 (#9697)
     21f9bc4 mapMaybe: Typo in the comment (#9644)
     c557f99 Disable AVX for LLVM 3.2 by default (#9391)
     e7b414a Fix detection of GNU gold linker if invoked via gcc with parameters
     a736b51 Revert "base: Fix (**) instance for Data.Complex (#8539)"
     483eeba Comments only
     1019e3c When outputting list of available instances, sort it.
     7c748d9 Support for "with" renaming syntax, and output a feature flag.
     4224466 Reimplement im/export primitives for integer-gmp2
     e2af452 Restore exact old semantics of `decodeFloat`
     e762b6e Update baseline shift/reduce conflict number
     10bd68e Add support for pattern synonym type signatures. Syntax is of the form
     e199b05 Update Haddock to new pattern synonym type signature syntax