[GHC] #8472: Primitive string literals prevent optimization

[GHC]

#8472: Primitive string literals prevent optimization
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        Reporter:  akio              |                Owner:  gridaphobe
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.6.3
      Resolution:                    |             Keywords:  newcomer
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Runtime           |  (amd64)
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by akio):

 Ack, I have also been working on this, but it seems like @gridaphobe's
 patches are closer to be ready (I haven't updated the core lint to check
 the new invariant).

 Here is a link to my patch in case it contains anything useful:
 https://github.com/takano-
 akio/ghc/commit/abd74a0d1fdde0e75d46bf1ff255ed4966a020ad

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8472#comment:9>
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