[GHC] #5075: CPR optimisation for sum types if only one constructor is used

[GHC]

#5075: CPR optimisation for sum types if only one constructor is used
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        Reporter:  batterseapower    |            Owner:  simonpj
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:  7.6.2
       Component:  Compiler          |          Version:  7.0.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by simonpj):

 An 8% increase in binary size is pretty dramatic.  I wonder why that is
 happening. (Not every easy to find out.)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5075#comment:20>
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