[GHC] #9447: Add support for resizing `MutableByteArray#`s

[GHC]

#9447: Add support for resizing `MutableByteArray#`s
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        Reporter:  hvr               |                   Owner:
            Type:  feature request   |                  Status:  patch
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.8.2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D133,
                                     |  Phab:D1139
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Comment (by bgamari):

 hvr, I discussed this briefly with Simon Marlow in the meeting last week
 and he indicated that it may not be too tricky to implement efficient
 growing of ByteArrays. Perhaps you'd like to discuss this with him
 (assuming you still believe this is a worthwhile optimization)?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9447#comment:6>
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