[GHC] #9291: Don't reconstruct sum types if the type subtly changes

[GHC]

#9291: Don't reconstruct sum types if the type subtly changes
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        Reporter:  schyler           |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.8.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by osa1):

 Is this related with typed-ness of the IR? I think if we do some of the
 transformations we do during `coreToStg` we would have the same problem in
 Core
 too.

 I'm wondering if a solution could be as simple as treating state tokens as
 different from each other when comparing expressions...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9291#comment:35>
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