[GHC] #10818: GHC 7.10.2 takes much longer to compile some packages

[GHC]

#10818: GHC 7.10.2 takes much longer to compile some packages
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        Reporter:  kazu-yamamoto     |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      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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Comment (by dfeuer):

 Git bisect indicates that the regression in `Data.IP.Addr` occurred in
 b9e49d3e9580e13d89efd1f779cb76f610e0d6e0 "Add -fspecialise-aggressively".
 Compiler allocation with `-O` increased from 1.53GB to 2.25GB and
 compilation time increased from 1.8s to 2.6s. Is this to be expected?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10818#comment:17>
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