[commit: ghc] wip/T10293's head updated: Call Arity: Trade precision for performance in large mutually recursive groups (2f3aa54)

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

Branch 'wip/T10293' now includes:

     edc059a Fix autoconf's check for create_timer()
     a5745d2 Derive Generic instance for System.Exit.ExitCode
     c327393 Derive Generic instance for Data.Version.Version
     6109b31 use projectVersion from DynFlags rather than cProjectVersion for versionedAppDir
     8aefc9b parser: opt_kind_sig has incorrect SrcSpan
     9eab6fe parser: API Annotations : guardquals1 does not annotate commas properly
     919b511 parser : the API annotation on opt_sig is being discarded
     d261d4c Zap usage info in CSE (Trac #10218)
     25f2d68 Comments only
     a2ce3af Comments and white space only
     7febc2b Add "error:" prefix to error-messages
     79bfe27 Remove LlvmCodeGen panic variants.
     8dc2944 API Annotations : ExprWithTySig processing discards annotated spans
     5fded20 ApiAnnotations : lexer discards comment close in nested comment
     6dd2765 Implement -f[no-]print-unicode-syntax flag for unicode syntax output (#8959)
     7b042d5 Do not allow Typeable on constraints (Trac #9858)
     49d9b00 Fix fundep coverage-condition check for poly-kinds
     a9ca67f Improve Call Arity performance
     2f3aa54 Call Arity: Trade precision for performance in large mutually recursive groups