[GHC] #656: Provde a way to return values as Dynamic from the GHC API

[GHC]

#656: Provde a way to return values as Dynamic from the GHC API
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    Reporter:  simonmar  |        Owner:             
        Type:  task      |       Status:  new        
    Priority:  normal    |    Milestone:  6.6        
   Component:  Compiler  |      Version:  6.4.1      
    Severity:  normal    |     Keywords:             
          Os:  Unknown   |   Difficulty:  Easy (1 hr)
Architecture:  Unknown   |  
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Requested by Keith Hanna:  the GHC API should have a way to return the
 value of an expression or statement from {{{runStmt}}} as a {{{Dynamic}}}.
 This would let you inspect the returned value in the client, whereas
 currently the only workaround is to compile more code to inspect the value
 and communicate the results back via some mutable state.

 For reference, hs-plugins has a similar feature.

 Depends on Task #652.

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Ticket URL: <http://cvs.haskell.org/trac/ghc/ticket/656>
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