[GHC] #5925: Add inline version of newArray#

[GHC]

#5925: Add inline version of newArray#
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        Reporter:  tibbe             |            Owner:  simonmar
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:  7.6.2
       Component:  Compiler          |          Version:  7.4.1
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:  4258
        Blocking:                    |  Related Tickets:
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Changes (by tibbe):

 * owner:   => simonmar


Comment:

 Simon, if you could point out any opportunities to break out code from
 `doNewArrayOp` into reusable allocation primitives that would be great.
 After this patch I want to support inline allocation in the clone array
 family of primops, so the more reusable the pieces are the better the code
 will look.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5925#comment:16>
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