[GHC] #8226: Remove the old style -- # Haddock comments.

[GHC]

#8226: Remove the old style -- # Haddock comments.
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        Reporter:  Fuuzetsu          |            Owner:
            Type:  task              |           Status:  patch
        Priority:  normal            |        Milestone:  7.10.1
       Component:  Compiler          |          Version:  7.7
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by Fuuzetsu):

 Sorry I fell behind a bit on reading GHC tickets.

 Yes adinapoli, those should also be removed, we do not use --# for
 anything and it served the same purpose as {-# as far as I know.

 Also the data type used to store that type of comment should be removed:

 https://github.com/ghc/ghc/blob/master/compiler/parser/Lexer.x#L625

 FTR the Haddock ticket is now tracked at
 https://github.com/haskell/haddock/issues/171

 Thanks for looking into this, feel free to poke me on IRC/e-mail if you
 need more immediate review.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8226#comment:5>
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