[GHC] #7847: Maintain per-generation lists of weak pointers

[GHC]

#7847: Maintain per-generation lists of weak pointers
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Reporter:  akio                          |          Owner:                  
    Type:  feature request               |         Status:  patch           
Priority:  normal                        |      Component:  Runtime System  
 Version:  7.7                           |       Keywords:                  
      Os:  Unknown/Multiple              |   Architecture:  Unknown/Multiple
 Failure:  Compile-time performance bug  |      Blockedby:                  
Blocking:                                |        Related:                  
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Comment(by akio):

 I rebased the patches.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7847#comment:8>
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