[GHC] #2159: Use a more efficient representation than [DynFlag]

[GHC]

#2159: Use a more efficient representation than [DynFlag]
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    Reporter:  igloo             |        Owner:                              
        Type:  bug               |       Status:  new                         
    Priority:  low               |    Milestone:  7.0.1                       
   Component:  Compiler          |      Version:  6.8.2                       
    Keywords:                    |     Testcase:                              
   Blockedby:                    |   Difficulty:  Unknown                     
          Os:  Unknown/Multiple  |     Blocking:                              
Architecture:  Unknown/Multiple  |      Failure:  Compile-time performance bug
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Comment(by simonmar):

 Replying to [comment:8 igloo]:
 > I don't think we should apply the patch, incidentally. It would be a
 maintenance nightmare.

 That's what I thought too when I saw it.  Have you tried just using an
 `IntMap`?

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2159#comment:9>
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