[GHC] #4960: Better inlining test in CoreUnfold

[GHC]

#4960: Better inlining test in CoreUnfold
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        Reporter:  simonpj           |                Owner:
            Type:  task              |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  7.0.1
      Resolution:                    |             Keywords:  newcomer,
                                     |  Inlining
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by alexbiehl):

 I don't know if this is that well defined. I have tried to implement this.
 Please take a look at
 https://github.com/alexbiehl/ghc/commit/fd9608ea93fc2389907b82c3fe540805d986c28e.
 Is this what you were talking about @simonpj?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4960#comment:13>
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