[GHC] #7284: plusAddr# x 0 isn't optimised away

[GHC]

#7284: plusAddr# x 0 isn't optimised away
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    Reporter:  rl                |       Owner:  igloo                  
        Type:  bug               |      Status:  new                    
    Priority:  high              |   Milestone:  7.8.1                  
   Component:  Compiler          |     Version:  7.6.1                  
    Keywords:                    |          Os:  Unknown/Multiple       
Architecture:  Unknown/Multiple  |     Failure:  Runtime performance bug
  Difficulty:  Unknown           |    Testcase:                         
   Blockedby:                    |    Blocking:                         
     Related:                    |  
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Comment(by simonmar):

 This will disappear in the backend anyway (though I realise there are
 reasons to want it to disappear earlier).

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7284#comment:2>
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