[GHC] #4928: Add primops for copying/cloning an array

[GHC]

#4928: Add primops for copying/cloning an array
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    Reporter:  tibbe             |       Owner:                
        Type:  feature request   |      Status:  new           
    Priority:  normal            |   Component:  Runtime System
     Version:  7.0.1             |    Keywords:                
    Testcase:                    |   Blockedby:                
          Os:  Unknown/Multiple  |    Blocking:                
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown  
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Comment(by pumpkin):

 The patch is incomplete. I've written out what I think should be in the
 copyArray# and copyMutableArray# primops but the clones and freeze/thaw
 are still empty stubs (so don't call them!). I'm mostly looking for
 comments about the card marking adjustments, which are new and untested
 since my original patch.

 It would be slightly smarter to set the boundary cards to the conjunction
 of the source and destination cards at that point, but setting them both
 to 1 unconditionally was simpler.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4928#comment:2>
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