[GHC] #8646: Distinguish between update frames in rts/Printer.c

[GHC]

#8646: Distinguish between update frames in rts/Printer.c
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       Reporter:  Tarrasch          |             Owner:  simonmar
           Type:  feature request   |            Status:  new
       Priority:  lowest            |         Milestone:  _|_
      Component:  Runtime System    |           Version:  7.6.3
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 When doing printf-debugging and using Printer.c, it would be nice to see
 exact kind of update frame. (See attached patch)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8646>
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