[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
      Resolution:                    |             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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Description changed by br1:

Old description:

> 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.

New description:

 Compile time with -O 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#comment:1>
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