[commit: ghc] master's head updated: Introduce coerce :: Coercible a b -> a -> b (17a868a)

[git at git.haskell.org]

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

Branch 'master' now includes:

     e239753 Allow primclass and class constraints in primops
     81928d0 Expose more in the TcS monad
     1f17065 Outputable.isOrAre: "is" or "are" for correct grammar
     638da2f Expose tcTyConsOfType as Types.tyConsOfType
     17a868a Introduce coerce :: Coercible a b -> a -> b