[GHC] #7944: GHC goes into an apparently infinite loop at -O2

[GHC]

#7944: GHC goes into an apparently infinite loop at -O2
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        Reporter:  bos               |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.9
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash                              |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:  #5550 #8852       |  Differential Revisions:
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Comment (by thomie):

 Yes, infinite loop with ghc-7.10.2 as well as ghc-7.11.20150711 (HEAD).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7944#comment:9>
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