[GHC] #14596: Remove uses of unsafeGlobalDynFlags for state hack

[GHC]

#14596: Remove uses of unsafeGlobalDynFlags for state hack
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        Reporter:  bgamari           |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4265
       Wiki Page:                    |
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Comment (by dobenour):

 It seems like the logical place to put this is as a flag in `TyCon`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14596#comment:2>
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