[GHC] #10143: Separate PprFlags (used by Outputable) from DynFlags

[GHC]

#10143: Separate PprFlags (used by Outputable) from DynFlags
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        Reporter:  ezyang            |                Owner:  ezyang
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.11
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10961            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 Dalaing, what ever happened to this?

 I would like to see this happen. Currently it is significantly harder than
 necessary for API users to use the pretty printer due to the spurious
 dependence on the entirety of `DynFlags`. Moreover, this dependency leads
 to an awkward coupling between the printer and the all encompassing
 `DynFlags` module, leading to a proliferation of import loops.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10143#comment:17>
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