[GHC] #5218: Add unpackCStringLen# to create Strings from string literals

[GHC]

#5218: Add unpackCStringLen# to create Strings from string literals
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        Reporter:  tibbe             |                   Owner:
            Type:  feature request   |  thoughtpolice
        Priority:  normal            |                  Status:  new
       Component:  Compiler          |               Milestone:  7.12.1
      Resolution:                    |                 Version:  7.0.3
Operating System:  Unknown/Multiple  |                Keywords:
 Type of failure:  Runtime           |            Architecture:
  performance bug                    |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:  #5877 #10064      |                Blocking:
                                     |  Differential Revisions:
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Changes (by hvr):

 * related:  5877 => #5877 #10064


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/5218#comment:31>
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