[GHC] #4960: Better inlining test in CoreUnfold

[GHC]

#4960: Better inlining test in CoreUnfold
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    Reporter:  simonpj           |        Owner:              
        Type:  bug               |       Status:  new         
    Priority:  normal            |    Milestone:  7.4.1       
   Component:  Compiler          |      Version:  7.0.1       
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by simonpj):

 See #3781, #3755, which would find this optimisation useful.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4960#comment:2>
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