[GHC] #8894: Clean up `Coercible` plumbing

[GHC]

#8894: Clean up `Coercible` plumbing
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        Reporter:  nomeata           |            Owner:
            Type:  task              |           Status:  closed
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.9
      Resolution:  fixed             |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:  #8904
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Changes (by nomeata):

 * status:  new => closed
 * resolution:   => fixed
 * related:   => #8904


Comment:

 Ok, pushed. The haddock/GHC API issue is at #8904.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8894#comment:5>
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