[GHC] #9233: Compiler performance regression

[GHC]

#9233: Compiler performance regression
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        Reporter:  augustss      |            Owner:
            Type:  bug           |           Status:  new
        Priority:  low           |        Milestone:
       Component:  Compiler      |          Version:  7.8.2
      Resolution:                |         Keywords:
Operating System:  Windows       |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |       Difficulty:  Unknown
       Test Case:                |       Blocked By:
        Blocking:                |  Related Tickets:
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Comment (by augustss):

 I've attached an example.  Run the command
 {{{
 ghc --make -O2 -fno-spec-constr Options.hs
 }}}
 On my machine it takes 17s with ghc-7.6 and 38s with ghc-7.8.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9233#comment:8>
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