[GHC] #13523: Be more explicit in generated case alternatives

[GHC]

#13523: Be more explicit in generated case alternatives
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        Reporter:  bgamari           |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Do this on the branch on #13397, which we still need to commit, after
 double-checking perf. (Might you do that Reid?)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13523#comment:6>
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