[GHC] #8767: Add rules involving `coerce` to the libraries

[GHC]

#8767: Add rules involving `coerce` to the libraries
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        Reporter:  nomeata           |                   Owner:  ekmett
            Type:  task              |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Core Libraries    |                 Version:  7.9
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
                                     |  tests/simplCore/should_run/T2110.hs
      Blocked By:  8718              |                Blocking:
 Related Tickets:  #2110             |  Differential Revisions:
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Comment (by nomeata):

 `Data.Map` already has rules for `map`, this [pull
 request](https://github.com/haskell/containers/pull/163) adds them for
 `mapKeysMonotonic`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8767#comment:29>
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