[GHC] #5271: Compilation speed regression

[GHC]

#5271: Compilation speed regression
---------------------------------+------------------------------------------
    Reporter:  augustss          |       Owner:              
        Type:  bug               |      Status:  new         
    Priority:  normal            |   Component:  Compiler    
     Version:  7.0.4             |    Keywords:              
    Testcase:                    |   Blockedby:              
          Os:  Unknown/Multiple  |    Blocking:              
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown
---------------------------------+------------------------------------------
 Ghc has gotten slower at compiling.
 Compilation time for our code base in 6.12.4 was 23:40, and with the 7.0.4
 it is 29:30.  This is a 25% increase in compilation time.  Both
 compilations with the same flags, -O2 being the most important one.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5271>
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