[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
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2074
       Wiki Page:                    |
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Comment (by simonpj):

 Yes this is OK.  It comes from the fast that previously we were commoning
 up two wrappers, but now we don't because we are paranoid about CSEing
 things with unfoldings.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11781#comment:12>
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