[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:D3461
       Wiki Page:                |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"b894f02058a10b5b0a4074020feae2771e793577/ghc" b894f02/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="b894f02058a10b5b0a4074020feae2771e793577"
 Remove redundant flag (-O) registration (fixes #13392)

 Reviewers: austin, bgamari, dfeuer

 Reviewed By: bgamari, dfeuer

 Subscribers: rwbarton, thomie

 GHC Trac Issues: #13392

 Differential Revision: https://phabricator.haskell.org/D3461
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13392#comment:7>
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