[GHC] #14944: Compile speed regression

[GHC]

#14944: Compile speed regression
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           Reporter:  br1            |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.4.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Compile-time
  Unknown/Multiple                   |  performance bug
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Compile time went from 5 seconds in 7.6.1 to 12 seconds in 8.2.2 and then
 down to 10 seconds in 8.4.1.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14944>
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