[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   |       Status:  new         
    Priority:  high              |    Milestone:  7.4.1       
   Component:  Compiler          |      Version:  7.0.3       
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by tibbe):

 If solution two works I'm for it. It feels a bit complex but perhaps
 there's no better option. I'm against solution 1 as it would make most
 Haskell programs Template Haskell programs, as byte string literals are
 quite common, and that feels a bit too much to solve this problem.

 If we could have proper byte string literals (ala Python's b"...") that
 would be even better but I guess that would be a too invasive change.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5218#comment:5>
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