[GHC] #11709: Merge some TypeInType fixes

[GHC]

#11709: Merge some TypeInType fixes
-------------------------------------+-------------------------------------
           Reporter:  goldfire       |             Owner:
               Type:  bug            |            Status:  new
           Priority:  highest        |         Milestone:  8.0.1
          Component:  Compiler       |           Version:  8.1
           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:
-------------------------------------+-------------------------------------
 There are a few more commits to merge, that didn't fit with a single
 ticket:

 * de4df6b41a227f527e9eb77733cd6c87b069d3d0
 * 3f5d1a13f112f34d992f6b74656d64d95a3f506d
 * 6c768fcf0d6749bf5029baf6b7f99271b48b1037
 * 18fbfa39104b92a05061ec5f6f5bf3b84b462605

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11709>
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