[GHC] #12757: Compiled program segfaults at -O1

[GHC]

#12757: Compiled program segfaults at -O1
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        Reporter:  hvr               |                Owner:
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime crash     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by hvr):

 I was informed by slyfox that this is much related (almost to the point of
 being a duplicate) of #12585, which in turn is a duplicate of #11312

 I do consider this a blocker for GHC 8.0.2 as the repro-case above is code
 that's surely not exotic...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12757#comment:1>
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