[GHC] #15300: Unboxed Sums Crash

[GHC]

#15300: Unboxed Sums Crash
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        Reporter:  andrewthad        |                Owner:  osa1
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.5
      Resolution:                    |             Keywords:  UnboxedSums
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 osa1):

 > Basically StgCse reverts unarise by using case binders when scrutinee is
 a unboxed tuple

 I should add that this is only a bug when we run StgCse after unarise.
 Before unarise unboxed tuple terms can be replaced by case binders.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15300#comment:19>
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