[GHC] #11781: Improve common sub-expression

[GHC]

#11781: Improve common sub-expression
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           Reporter:  simonpj        |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.10.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):  Phab:D2074     |         Wiki Page:
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 I wrote a patch that refactors and improves the CSE pass.

 It's in `wip/cse-code-desmelling`, and Phab:D2074

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11781>
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