[GHC] #7086: haddock memory usage regression

[GHC]

#7086: haddock memory usage regression
---------------------------------+------------------------------------------
    Reporter:  igloo             |       Owner:                  
        Type:  bug               |      Status:  new             
    Priority:  highest           |   Milestone:  7.6.1           
   Component:  None              |     Version:  7.5             
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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 Haddock uses a lot more memory than it used to.

 Attached are `haddock-before.png`, showing memory usage of
 4dc9ecd3905f75adb6bcfb818fbc163c724d4545, and `haddock-after.png`, showing
 memory usage of 7f164839d8b0b6e53fa0f15d2a6810ca310e337d, while haddocking
 the ghc package.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7086>
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