[GHC] #13002: :set -O does not work in .ghci file

[GHC]

#13002: :set -O does not work in .ghci file
-------------------------------------+-------------------------------------
        Reporter:  George            |                Owner:  RolandSenn
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.10.1
       Component:  GHCi              |              Version:  8.0.1
      Resolution:                    |             Keywords:
                                     |  RecompilationCheck
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:  T13002
      Blocked By:                    |             Blocking:
 Related Tickets:  #8635 #9370       |  Differential Rev(s):
       Wiki Page:                    |  https://gitlab.haskell.org/ghc/ghc/merge_requests/480
-------------------------------------+-------------------------------------
Changes (by RolandSenn):

 * status:  new => patch
 * testcase:   => T13002
 * differential:   => https://gitlab.haskell.org/ghc/ghc/merge_requests/480


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13002#comment:19>
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