[GHC] #2576: bio and retainer profiling segfaults

[GHC]

#2576: bio and retainer profiling segfaults
--------------------------+-------------------------------------------------
    Reporter:  igloo      |       Owner:             
        Type:  bug        |      Status:  new        
    Priority:  normal     |   Milestone:  6.10.1     
   Component:  Profiling  |     Version:  6.9        
    Severity:  normal     |    Keywords:             
  Difficulty:  Unknown    |    Testcase:  heapprof001
Architecture:  Unknown    |          Os:  Unknown    
--------------------------+-------------------------------------------------
 `heapprof001(prof_hc_hb,prof_hr)` is segfaulting.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2576>
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