[GHC] #7058: Add strict version of modifySTRef

[GHC]

#7058: Add strict version of modifySTRef
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    Reporter:  joeyadams         |       Owner:  simonmar               
        Type:  feature request   |      Status:  new                    
    Priority:  high              |   Milestone:  7.6.1                  
   Component:  libraries/base    |     Version:  7.4.2                  
    Keywords:                    |          Os:  Unknown/Multiple       
Architecture:  Unknown/Multiple  |     Failure:  Runtime performance bug
  Difficulty:  Unknown           |    Testcase:                         
   Blockedby:                    |    Blocking:                         
     Related:                    |  
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Changes (by simonmar):

  * owner:  => simonmar
  * difficulty:  => Unknown
  * priority:  normal => high
  * milestone:  => 7.6.1


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7058#comment:1>
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