[GHC] #1371: Add -O3

[GHC]

#1371: Add  -O3
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    Reporter:  simonmar          |        Owner:                  
        Type:  task              |       Status:  new             
    Priority:  normal            |    Milestone:  _|_             
   Component:  Compiler          |      Version:  6.6.1           
    Severity:  normal            |   Resolution:                  
    Keywords:                    |   Difficulty:  Moderate (1 day)
    Testcase:                    |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |  
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Changes (by igloo):

  * milestone:  6.10 branch => _|_

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1371#comment:3>
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