[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:
            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 j.waldmann):

 Oh, I was timing "cabal install" (not just "cabal build") because I assume
 that is what is being timed on travis.

 Meanwhile, I did repeat the builds with 7.10.3 instead of 7.10.2, see
 https://travis-ci.org/jwaldmann/haskell-tpdb/builds/109177528
 https://travis-ci.org/jwaldmann/haskell-obdd/builds/109179019
 and results look similar to before.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10818#comment:10>
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