[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 nomeata):

 Ok, setting up two new working copies with `prof` builds right now, one
 with and one without the patch. Hopefully they are built over the
 conference lunch. (This comment is just an ventilation of slight annoyance
 with the effort required to track down such issues, and does not require
 any reaction.)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11781#comment:6>
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