[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):

 > We could change the code in GHC.Base to have ...

 yes. It is sufficient to change it for `*>`, and leave `(>>) = (*>)`
 (which I believe is better practice, in case people look at that code for
 how to do it).

 Is this required even if we do the change to `active_unfolding_gentle`?

 > This could be a separate ticket

 Now at #11791.


 And is now this thing good to go?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11781#comment:10>
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