[GHC] #5413: Add population count primop

[GHC]

#5413: Add population count primop
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    Reporter:  tibbe             |        Owner:  simonmar    
        Type:  feature request   |       Status:  patch       
    Priority:  normal            |    Milestone:              
   Component:  Compiler          |      Version:  7.2.1       
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by simonmar):

 Shouldn't `-msse4.2`  imply `-msse2`?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5413#comment:3>
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