[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:  patch           
 Priority:  normal           |      Component:  Runtime System  
  Version:  7.0.1            |     Resolution:                  
 Keywords:                   |       Testcase:                  
Blockedby:                   |             Os:  Unknown/Multiple
 Blocking:                   |   Architecture:  Unknown/Multiple
  Failure:  None/Unknown     |  
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Comment(by pumpkin):

 These last two patches change the signature of cloneArray# to not pass
 around an unnecessary State# token, and update the associated test to work
 again with the new signature.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4928#comment:8>
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