[GHC] #15717: Performance regression in for_ alternatives from GHC 8.2.2 to newer GHCs

[GHC]

#15717: Performance regression in for_ alternatives from GHC 8.2.2 to newer GHCs
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        Reporter:  nh2               |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.6.1
      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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Changes (by nh2):

 * Attachment "TraverseMaybePerformanceSimplified-GHC-bug-15717-GHC-8.4.3
 .dump-simpl" added.


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15717>
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