[GHC] #11725: Performance Regression from 7.8.3 to 7.10.3

[GHC]

#11725: Performance Regression from 7.8.3 to 7.10.3
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        Reporter:  dominic           |                Owner:  dominic
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.3
      Resolution:  fixed             |             Keywords:
Operating System:  Linux             |         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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Changes (by bgamari):

 * status:  new => closed
 * resolution:   => fixed
 * milestone:   => 8.0.1


Comment:

 This seems to be one of many performance regressions in 7.10 which has
 mysteriously improved with 8.0. There have been a variety of performance
 improvements made in 8.0; it would be great to know which of these helped
 here. You, the reader, can help here by identifying which commit(s) are
 responsible for this improvement.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11725#comment:11>
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