[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:                  
     Type:  bug                      |         Status:  new             
 Priority:  normal                   |      Component:  Compiler        
  Version:  7.6.1                    |       Keywords:                  
       Os:  Unknown/Multiple         |   Architecture:  Unknown/Multiple
  Failure:  Runtime performance bug  |       Testcase:                  
Blockedby:                           |       Blocking:                  
  Related:                           |  
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 As the title says, there doesn't seem to be an optimisation rule for this.
 I'm not sure if adding one to base (where exactly?) would be enough or if
 it should be a built-in one.

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