[GHC] #16190: Speed up handling of large String literals

[GHC]

#16190: Speed up handling of large String literals
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        Reporter:  hsyl20            |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by hvr):

 Has any thought been given if and how this will interact with
 https://github.com/ghc-proposals/ghc-proposals/pull/135?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16190#comment:8>
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