[GHC] #7446: GHC -O0 goes into a loop

[GHC]

#7446: GHC -O0 goes into a loop
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Reporter:  EyalLotem     |          Owner:          
    Type:  bug           |         Status:  new     
Priority:  normal        |      Component:  Compiler
 Version:  7.6.1         |       Keywords:          
      Os:  Linux         |   Architecture:  x86     
 Failure:  None/Unknown  |      Blockedby:          
Blocking:                |        Related:          
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 -O1/-O2 don't loop.

 If I remove some of the types or the UNPACK, the problem ceases to
 reproduce.

 It does not reproduce on 7.4.1 or 7.0.4.

 Reproduces on multiple machines with 7.6.1.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7446>
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