[GHC] #11135: Migrate more of Data.Functor.* from transformers to base.

[GHC]

#11135: Migrate more of Data.Functor.* from transformers to base.
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           Reporter:  hvr            |             Owner:
               Type:  task           |            Status:  new
           Priority:  highest        |         Milestone:  8.0.1
          Component:                 |           Version:  7.10.2
  libraries/base                     |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 This was proposed in
 https://mail.haskell.org/pipermail/libraries/2015-July/026014.html

 Edward says the following modules are up for migration:

  - `Data.Functor.Classes`
  - `Data.Functor.Product`
  - `Data.Functor.Sum`
  - `Data.Functor.Compose`

 related/optionally/undecided:

  - `Data.Functor.Reverse`
  - `Control.Applicative.Backwards`

 not moved because redundant (c.f. `Const`):

  - `Data.Functor.Constant`

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11135>
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