[GHC] #16198: Cmm string literals shouldn't be represented as [Word8]

[GHC]

#16198: Cmm string literals shouldn't be represented as [Word8]
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           Reporter:  hsyl20         |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.6.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 While we use ByteString to represent string literals in Core/STG, they are
 unpacked into [Word8] when compiled into Cmm. This is bad for performance,
 especially with large strings and there is no reason to do it.

 Patch coming.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16198>
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