[GHC] #2790: Use -fregs-graph by default

[GHC]

#2790: Use -fregs-graph by default
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    Reporter:  igloo             |        Owner:  benl        
        Type:  task              |       Status:  new         
    Priority:  high              |    Milestone:  6.14.1      
   Component:  Compiler          |      Version:  6.8.3       
    Keywords:                    |   Difficulty:  Unknown     
          Os:  Unknown/Multiple  |     Testcase:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by benl):

 Status: languishing on my TODO list. I've blocked out a day for it next
 week.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2790#comment:18>
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