[commit: ghc] wip/pattern-synonyms's head updated: Reconstruct patsyn type from matcher type (f59ad68)

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

Branch 'wip/pattern-synonyms' now includes:

     e3938f3 Fix linked list manipulation code (buggy on consecutive deletion)
     7fa0b43 Make BlockAlloc.c comment slightly more accurate (fixes #8491)
     eeaea2d Instead of tracking Origin in LHsBindsLR, track it in MatchGroup
     80bdb88 Typos in comments
     b4a820f Update Haddock submodule to follow LHsBindsLR changes
     70d263e Better layout for coercion error message
     bfd0064 Tidy up trace message
     14046d0 A bit more trace information in an ASSERT failure
     e7f0ae7 Honour the untouchability of kind variables
     ff9f9a7 Test Trac #8985
     bea2018 Store IfExtNames for PatSyn matchers and wrappers in interface file
     d316f45 Fold mkPatSyn{Matcher,Wrapper}Id into TcPatSyn
     f59ad68 Reconstruct patsyn type from matcher type