[GHC] #8923: Add SmallArray# type

[GHC]

#8923: Add SmallArray# type
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        Reporter:  tibbe             |            Owner:  tibbe
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:  7.10.1
       Component:  Compiler          |          Version:  7.9
      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 tibbe):

 Let me know if you prefer to do the code review on GitHub and I'll push my
 changes there.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8923#comment:4>
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