[GHC] #15524: Performance regression when using the GHC API to evaluate code compared to 8.4

[GHC]

#15524: Performance regression when using the GHC API to evaluate code compared to
8.4
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        Reporter:  vaibhavsagar      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.6.1-beta1
      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 mpickering):

 The git hash of the commit for the repro is
 `ad0ec26cc976b7f263cc4781eead264b7080cc4e` just in case the branch
 mutates.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15524#comment:1>
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