[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 ezyang):

 I think the more refined claim is something like, "SDoc computations only
 need a minusculely small amount of the data structure, EXCEPT for the use
 of pretty-printing in the code generator, which also needs access to
 platform constants." The code generation pretty-printing is a small part
 of the overall story, so it might be worth to somehow deal with it
 specially.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10143#comment:13>
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