[GHC] #881: Improve space profiling for references

[GHC]

#881: Improve space profiling for references
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    Reporter:  simonpj           |       Owner:                  
        Type:  feature request   |      Status:  new             
    Priority:  normal            |   Milestone:  _|_             
   Component:  Profiling         |     Version:  6.4.2           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Comment(by simonmar):

 I think this might be fixed, since `MUT_VAR` is considered a retainer, but
 it needs testing (don't have prof libs installed on my laptop and I'm on
 slow wifi right now).

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/881#comment:8>
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