[GHC] #9317: Add PolyKinds extension to Data.Monoid

[GHC]

#9317: Add PolyKinds extension to Data.Monoid
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              Reporter:  bernalex    |             Owner:
                  Type:  bug         |            Status:  patch
              Priority:  low         |         Milestone:
             Component:              |           Version:  7.8.2
  libraries/base                     |          Keywords:
            Resolution:              |  Operating System:  Unknown/Multiple
Differential Revisions:              |   Type of failure:  None/Unknown
          Architecture:              |         Test Case:
  Unknown/Multiple                   |          Blocking:
            Difficulty:  Easy (less  |
  than 1 hour)                       |
            Blocked By:              |
       Related Tickets:              |
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Comment (by ekmett):

 This was very much an accidental regression, not something consciously
 done. Makes sense to fix it.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9317#comment:2>
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