[GHC] #11271: Costly let binding gets duplicated in IO action value

[GHC]

#11271: Costly let binding gets duplicated in IO action value
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        Reporter:  dramforever       |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 See #1168 which is the master ticket for this problem

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11271#comment:2>
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