[GHC] #15282: Document how equality-bearing constructors are promoted in Core

[GHC]

#15282: Document how equality-bearing constructors are promoted in Core
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        Reporter:  RyanGlScott       |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14845            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Richard Eisenberg <rae@…>):

 In [changeset:"26e9806ada8823160dd63ca2c34556e5848b2f45/ghc" 26e9806/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="26e9806ada8823160dd63ca2c34556e5848b2f45"
 Document and simplify tcInstTyBinders

 This fixes #15282.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15282#comment:2>
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