[GHC] #9136: Constant folding in Core could be better

[GHC]

#9136: Constant folding in Core could be better
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        Reporter:  simonpj           |                Owner:  (none)
            Type:  bug               |               Status:  infoneeded
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.8.2
      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):  Phab:D2858
       Wiki Page:                    |
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Comment (by klapaucius):

 reverted in
 https://github.com/ghc/ghc/commit/0e37361392a910ccbbb2719168f4e8d8272b2ae2

 but still remains in the 8.6 release notes

 https://github.com/ghc/ghc/commit/09128f3a3d754abcef63480bc7e2e901d30b155a

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9136#comment:25>
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