[GHC] #15219: Implement UnliftedNewtypes proposal

[GHC]

#15219: Implement UnliftedNewtypes proposal
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        Reporter:  andrewthad        |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.10.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
                                     |  UnliftedNewtypes, GHCProposal
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #1311             |  Differential Rev(s):  Phab:D4777,
       Wiki Page:                    |  https://gitlab.haskell.org/ghc/ghc/merge_requests/364
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Changes (by RyanGlScott):

 * differential:  Phab:D4777 => Phab:D4777,
     https://gitlab.haskell.org/ghc/ghc/merge_requests/364


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15219#comment:14>
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