[GHC] #5567: LLVM: Improve alias analysis / performance

[GHC]

#5567: LLVM: Improve alias analysis / performance
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    Reporter:  dterei            |       Owner:  dterei                 
        Type:  task              |      Status:  new                    
    Priority:  normal            |   Milestone:  7.6.1                  
   Component:  Compiler (LLVM)   |     Version:                         
    Keywords:                    |          Os:  Unknown/Multiple       
Architecture:  Unknown/Multiple  |     Failure:  Runtime performance bug
  Difficulty:                    |    Testcase:                         
   Blockedby:                    |    Blocking:                         
     Related:                    |  
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Comment(by dterei):

 Pushed an improvement: e10589a505b44f4f0394500c6a0d2db5baa7f3f4

 This gets the good code generated for the above benchmark improving
 performance by around 20%! Also added control to enable or disable if TBAA
 is used with: ba52053b95ccb417ca7ce08e85a45e49b5f49b0a

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5567#comment:7>
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