[GHC] #14868: -O -g breaks string literals

[GHC]

#14868: -O -g breaks string literals
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        Reporter:  akio              |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.5
      Resolution:  duplicate         |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14779, #14123    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by niteria):

 Nice test case, I added it to https://phabricator.haskell.org/D4470.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14868#comment:2>
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