[GHC] #3353: Add CLDouble support

[GHC]

#3353: Add CLDouble support
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  Reporter:  igloo             |          Owner:                  
      Type:  bug               |         Status:  new             
  Priority:  normal            |      Milestone:  _|_             
 Component:  Compiler          |        Version:  6.10.2          
  Severity:  normal            |       Keywords:                  
Difficulty:  Unknown           |       Testcase:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
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 The FFI spec says that we should support `CLDouble`, but we don't (#2793).

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3353>
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