[GHC] #7364: `foo !f = id . f` becomes non-strict with -O2

[GHC]

#7364: `foo !f = id . f` becomes non-strict with -O2
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    Reporter:  shachaf           |       Owner:                             
        Type:  bug               |      Status:  new                        
    Priority:  normal            |   Milestone:  _|_                        
   Component:  Compiler          |     Version:  7.6.1                      
    Keywords:                    |          Os:  Unknown/Multiple           
Architecture:  Unknown/Multiple  |     Failure:  Incorrect result at runtime
  Difficulty:  Unknown           |    Testcase:                             
   Blockedby:                    |    Blocking:                             
     Related:                    |  
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Comment(by simonmar):

 #5587 is marked fixed; maybe we should do the same with this one?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7364#comment:4>
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