[GHC] #13689: Data.Either doesn't export INLINABLE short functions like "rights"

[GHC]

#13689: Data.Either doesn't export INLINABLE short functions like "rights"
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        Reporter:  varosi            |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Core Libraries    |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect API     |  Unknown/Multiple
  annotation                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3576
       Wiki Page:                    |
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Comment (by rwbarton):

 I'd rather not give special treatment to `rights` which is not a very
 special function. It's common to write functions like `rights` for ones
 own types for example.

 Instead could we perhaps give a bigger bonus to unfoldings headed by
 `build`?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13689#comment:14>
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