[GHC] #8923: Add SmallArray# type

[GHC]

#8923: Add SmallArray# type
-------------------------------------+------------------------------------
        Reporter:  tibbe             |            Owner:  tibbe
            Type:  feature request   |           Status:  patch
        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:
-------------------------------------+------------------------------------
Changes (by tibbe):

 * status:  new => patch


Comment:

 Ready for review:
 https://github.com/tibbe/ghc/commit/f92141b2b2dc209e570cdc6fd727bf3efde450fc

 The change is relatively large, partly because there's a lot of test code.
 Once the change is in, I will see if I can refactor the code to have more
 code sharing with `Array#`.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8923#comment:8>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler