[GHC] #7907: patch to make comment about stgclosure struct more accurate

[GHC]

#7907: patch to make comment about stgclosure struct more accurate
---------------------------------+------------------------------------------
    Reporter:  carter            |       Owner:  simonmar         
        Type:  task              |      Status:  new              
    Priority:  normal            |   Milestone:  7.8.1            
   Component:  Runtime System    |     Version:  7.7              
    Keywords:                    |          Os:  Unknown/Multiple 
Architecture:  Unknown/Multiple  |     Failure:  Documentation bug
  Difficulty:  Unknown           |    Testcase:                   
   Blockedby:                    |    Blocking:                   
     Related:                    |  
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Changes (by igloo):

  * owner:  => simonmar
  * difficulty:  => Unknown
  * component:  Compiler => Runtime System
  * milestone:  => 7.8.1


Comment:

 Hmm, this seems a little odd to me. It looks like it's been this way since
 a2a67cd520b9841114d69a87a423dabcb3b4368e.

 Why aren't we just defining `StgClosure` here? Simon, do you remember?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7907#comment:1>
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