[GHC] #5210: Add primops for copying/cloning byte arrays

[GHC]

#5210: Add primops for copying/cloning byte arrays
---------------------------------+------------------------------------------
    Reporter:  tibbe             |        Owner:  dterei      
        Type:  feature request   |       Status:  patch       
    Priority:  high              |    Milestone:  7.2.1       
   Component:  Compiler          |      Version:  7.0.3       
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by dterei):

 I like the way the testing is done with having a guard value at each end.
 My only concern is this line:

 {{{
 -- Assign the arguments to temporaries so the code generator can
 -- calculate liveness for us.
 }}}

 I think its fine, its just I don't really understand it. I was originally
 going to say why are you doing this assigning stuff as the backends will
 take care of it and then noticed the comment above. Other code seems to
 follow this pattern so I assume you just kept with the trend.

 I'm pretty tired right now so will wait till tomorrow to do a quick check
 again before pushing.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5210#comment:10>
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