[GHC] #10755: Add `MonadPlus IO` and `Alternative IO` instances

[GHC]

#10755: Add `MonadPlus IO` and `Alternative IO` instances
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        Reporter:  hvr               |                   Owner:
            Type:  task              |                  Status:  patch
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Core Libraries    |                 Version:
      Resolution:                    |                Keywords:  report-
                                     |  impact
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D1148
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Comment (by RyanGlScott):

 If removing them from `transformers` causes too much heartburn, I'd be
 fine with asking Ross to put them back. My rationale when making that pull
 request was that putting orphan `IO` instances in a library about monad
 transformers didn't make much sense, and probably belong somewhere like
 `base-orphans` instead.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10755#comment:4>
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