[GHC] #12532: Remove sum and tuple names from knownKeyNames

[GHC]

#12532: Remove sum and tuple names from knownKeyNames
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        Reporter:  bgamari           |                Owner:
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 >  In writing this the solution here became fairly obvious: simply tell
 putName whether it is serializing a binding or non-binding occurrence.

 Yes, precisely.  Hence my name `putIfaceTopBndr`!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12532#comment:4>
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