[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:  patch
        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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Comment (by simonmar):

 I've attached my refactored patches, there are two patches that apply on
 top of the original newArray# patch.  The first is a patch I had lying
 around to change the representation of heap offsets from word to byte
 offsets, which turned out to be useful here too, so we might as well
 include it.

 I haven't tested this other than to eyeball the Cmm, which looks vaguely
 sensible.  Johan, if you could take it from here and run your tests, that
 would be great.  I think I'm still missing a bugfix that you applied in
 your second patch.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5925#comment:23>
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