[GHC] #1600: Optimisation: CPR the results of IO

[GHC]

#1600: Optimisation: CPR the results of IO
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        Reporter:  simonmar          |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  lowest            |            Milestone:
       Component:  Compiler          |              Version:  6.6.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #8598             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by mpickering):

 I rebased the branch here - https://github.com/mpickering/ghc/tree/nested-
 cpr

 I get 7 test failures running in simpleCore.

 There is also a core lint error when running a fresh build. I put it up on
 phab as well for easier viewing.
  (https://phabricator.haskell.org/D4244)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1600#comment:79>
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