[commit: ghc] wip/T14152's head updated: Inline exit join points in the "final" simplifier iteration (bf671fc)

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

Branch 'wip/T14152' now includes:

     671b1ed User’s guide: Properly link to RTS flag -V
     8843a39 Include usg_file_hash in ghc --show-iface output
     3825b7e Remove the 'legroom' part of the timeout-accurate-pure test.
     b62097d Windows: Bump to GCC 7.2 for GHC 8.4
     e888a1f Revert "Windows: Bump to GCC 7.2 for GHC 8.4"
     561bdca Update Win32 version for GHC 8.4.
     f744261 ghc-cabal: Inline removed function from Cabal.
     2e16a57 Revert "ghc-cabal: Inline removed function ..."
     b1ad0bb Revert "Update Win32 version for GHC 8.4."
     61f1b46 Make language extensions their own category in the documentation
     bf83435 typecheck: Clarify errors mentioned in #14385
     bd53b48 Add info about Github pull requests.
     2a4c24e Make layLeft and reduceDoc stricter (#7258)
     980e127 Windows: Update the mirror script to generate hashes and use mirror fallback
     1c15d8e Fix space leak in BinIface.getSymbolTable
     df63668 Performance improvements linear regAlloc (#7258)
     f7f270e Implement `-Wpartial-fields` warning (#7169)
     821adee Fix a bug in 'alexInputPrevChar'
     2c23fff user-guide: Clarify default optimization flags
     4c06ccb base: Enable listToMaybe to fuse via foldr/build
     dbd81f7 Factor out readField (#14364)
     7970d58 Implement a dedicated exitfication pass #14152
     e4a830c Run exitification only early
     33e13d3 Run exitification before the main simplifier
     05d3ddc Run exitification after demand analysis
     e6d5e13 Run exitification before the final simplifier run
     bf671fc Inline exit join points in the "final" simplifier iteration