[GHC] #13392: ghc --show-options lists flags twice

[GHC]

#13392: ghc --show-options lists flags twice
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        Reporter:  ThreeFx       |                Owner:  SantiM
            Type:  bug           |               Status:  new
        Priority:  low           |            Milestone:  ⊥
       Component:  Compiler      |              Version:  8.0.1
      Resolution:                |             Keywords:  newcomer
Operating System:  Linux         |         Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):  Phab:B15301
       Wiki Page:                |
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Changes (by SantiM):

 * differential:   => Phab:B15301


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13392#comment:4>
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