[GHC] #7775: Mark intentionally omitted type class instances

[GHC]

#7775: Mark intentionally omitted type class instances
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Reporter:  Lemming           |          Owner:                         
    Type:  feature request   |         Status:  new                    
Priority:  normal            |      Component:  Compiler (Type checker)
 Version:  7.6.2             |       Keywords:  instance warning       
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple       
 Failure:  None/Unknown      |      Blockedby:                         
Blocking:                    |        Related:                         
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Comment(by monoidal):

 The "possible fix" message was already removed in 7.6 (#7222).

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7775#comment:1>
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