[GHC] #12464: Add `instance Semigroup a => Semigroup (IO a)`

[GHC]

#12464: Add `instance Semigroup a => Semigroup (IO a)`
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        Reporter:  Iceland_jack      |                Owner:
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Core Libraries    |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2588
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * status:  new => patch
 * differential:   => Phab:D2588


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12464#comment:1>
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