[GHC] #12461: Document -O3

[GHC]

#12461: Document -O3
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        Reporter:  crockeea          |                Owner:  (none)
            Type:  task              |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  invalid           |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by mpickering):

 * status:  new => closed
 * resolution:   => invalid


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12461#comment:2>
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