[GHC] #11179: Allow plugins to access "dead code"

[GHC]

#11179: Allow plugins to access "dead code"
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        Reporter:  lerkok            |                Owner:
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10823            |  Differential Rev(s):  Phab:D3073
       Wiki Page:                    |
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Comment (by gridaphobe):

 (I'm happy to implement my suggestion, it would also let me finish the
 languishing Phab:D1565 and remove the desugarer fork we use in
 LiquidHaskell)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11179#comment:16>
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