[GHC] #3843: Merge plugins into HEAD

[GHC]

#3843: Merge plugins into HEAD
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    Reporter:  dreixel           |       Owner:  simonpj     
        Type:  merge             |      Status:  new         
    Priority:  normal            |   Component:  Compiler    
     Version:  6.13              |    Keywords:              
          Os:  Unknown/Multiple  |    Testcase:              
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown
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Comment(by dreixel):

 I would want core plugins to experiment with certain optimizations for
 generic programs, mostly related to inlining. Since this is rather
 experimental, plugins would allow easy modification of the core-to-core
 pass for testing (rather than having to recompile the compiler with an
 extra hard-coded core-to-core pass).

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3843#comment:1>
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