[GHC] #879: Merge GHCi.debugger patches

[GHC]

#879: Merge GHCi.debugger patches
----------------------+-----------------------------------------------------
 Reporter:  mnislaih  |          Owner:  mnislaih        
     Type:  task      |         Status:  assigned        
 Priority:  normal    |      Milestone:  6.6.1           
Component:  Compiler  |        Version:  6.5             
 Severity:  normal    |     Resolution:                  
 Keywords:            |     Difficulty:  Moderate (1 day)
 Testcase:  N/A       |   Architecture:  Unknown         
       Os:  Unknown   |  
----------------------+-----------------------------------------------------
Changes (by igloo):

  * testcase:  => N/A

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/879>
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