[GHC] #13367: CSE not working for top-level literal strings

[GHC]

#13367: CSE not working for top-level literal strings
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           Reporter:  simonpj        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           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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 Consider
 {{{
 {-# LANGUAGE MagicHash #-}
 module S( z ) where
 import GHC.Exts

 data T = MkT Addr#

 x = MkT "foo"#
 y = MkT "foo"#

 z = (x,y)
 }}}
 You'd expect those literal strings to get CSE'd but currently they are
 not.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13367>
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