[GHC] #10530: Update transformers library

[GHC]

#10530: Update transformers library
-------------------------------------+-------------------------------------
              Reporter:              |             Owner:
  thoughtpolice                      |            Status:  new
                  Type:  bug         |         Milestone:  7.10.2
              Priority:  normal      |           Version:  7.10.2-rc1
             Component:  libraries   |  Operating System:  Unknown/Multiple
  (other)                            |   Type of failure:  Other
              Keywords:              |        Blocked By:
  transformers                       |   Related Tickets:
          Architecture:              |
  Unknown/Multiple                   |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
 As noted in a reply to the RC1 announcement, we should update
 `transformers` to the latest version (which merely adds some new instances
 for `Const`).

 We should also do a once over for the other libraries.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10530>
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