[GHC] #15195: Merge -XPolyKinds with -XTypeInType

[GHC]

#15195: Merge -XPolyKinds with -XTypeInType
-------------------------------------+-------------------------------------
           Reporter:  goldfire       |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.2.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):  Phab:D4748     |         Wiki Page:
-------------------------------------+-------------------------------------
 As described in [https://github.com/ghc-proposals/ghc-
 proposals/blob/master/proposals/0020-no-type-in-type.rst this accepted
 proposal].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15195>
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