[GHC] #10049: Lower level memcpy primop

[GHC]

#10049: Lower level memcpy primop
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        Reporter:  chadaustin        |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.8.4
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
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Comment (by bgamari):

 For the record we have had `rep movsw` support for quite a while as a
 result of Phab:D166.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10049#comment:2>
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