[GHC] #9801: Make listArray fuse

[GHC]

#9801: Make listArray fuse
-------------------------------------+-------------------------------------
       Reporter:  dfeuer             |                   Owner:  dfeuer
           Type:  task               |                  Status:  new
       Priority:  normal             |               Milestone:  7.10.1
      Component:  Core Libraries     |                 Version:  7.9
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Moderate (less     |         Type of failure:  Runtime
  than a day)                        |  performance bug
     Blocked By:                     |               Test Case:
Related Tickets:                     |                Blocking:
                                     |  Differential Revisions:  Phab:D474
-------------------------------------+-------------------------------------
 `GHC.Arr.listArray` does not currently fuse with a good list producer.
 Let's make that happen.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9801>
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