[GHC] #8296: Patch: new primops for byte range copies ByteArray# <-> Addr#

[GHC]

#8296: Patch: new primops for byte range copies ByteArray# <-> Addr#
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        Reporter:  duncan            |            Owner:
            Type:  feature request   |           Status:  patch
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by rwbarton):

 It looks like the comments in `doCopyByteArrayToAddrOp` and
 `doCopyAddrToByteArrayOp` were copied from `doCopyByteArrayOp`. Actually,
 the reason it's okay to assume the memory ranges aren't overlapping in the
 former two functions is that that is a precondition of the primop.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8296#comment:3>
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