[GHC] #8914: Remove unnecessary constraints from MonadComprehensions and ParallelListComp

[GHC]

#8914: Remove unnecessary constraints from MonadComprehensions and
ParallelListComp
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        Reporter:  Iceland_jack      |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler (Type    |          Version:
  checker)                           |         Keywords:
      Resolution:                    |     Architecture:  Unknown/Multiple
Operating System:  Unknown/Multiple  |       Difficulty:  Difficult (2-5
 Type of failure:  None/Unknown      |  days)
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by Iceland_jack):

 I wrote a quick entry GeneralizedMonadComprehensions but I haven't added
 the specification, I may do so at a later date.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8914#comment:2>
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