[GHC] #10858: Smaller generated instances

[GHC]

#10858: Smaller generated instances
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              Reporter:  nomeata     |             Owner:
                  Type:  task        |            Status:  new
              Priority:  normal      |         Milestone:
             Component:  Compiler    |           Version:  7.10.2
              Keywords:              |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
             Test Case:              |        Blocked By:
              Blocking:              |   Related Tickets:
Differential Revisions:              |
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 With very large modules with lots of deriving code, GHC spends quite some
 time compiling. I believe that we can improve things by reducing the size
 of the generated code.

 (More in the comments)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10858>
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