[GHC] #8900: unordered-containers 16% slower in HEAD vs 7.6.3

[GHC]

#8900: unordered-containers 16% slower in HEAD vs 7.6.3
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        Reporter:  tibbe                    |            Owner:
            Type:  bug                      |           Status:  new
        Priority:  normal                   |        Milestone:
       Component:  Compiler                 |          Version:  7.9
      Resolution:                           |         Keywords:
Operating System:  MacOS X                  |     Architecture:  x86_64
 Type of failure:  Runtime performance bug  |  (amd64)
       Test Case:                           |       Difficulty:  Unknown
        Blocking:                           |       Blocked By:
                                            |  Related Tickets:
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Comment (by tibbe):

 I also see some changes in the Core. I've attached both the Core and
 optimized Cmm output.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8900#comment:3>
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