[GHC] #11465: Eliminate check_lifted check in TcValidity

[GHC]

#11465: Eliminate check_lifted check in TcValidity
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           Reporter:  simonpj        |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.10.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 In `TcValidity`, when checking for valid types, we had a long-standing
 test, embodied in a local function called `check_lifted`, which checked
 that a number of places had a lifted type of kind `*` and not an unlifted
 one of kind `#`.

 But that test is out-dated now; the kind system does the job.

 So this ticket is to remove the `check_lifted` test.  See the discussion
 in #11120, starting at comment:19.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11465>
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