[GHC] #16254: INLINABLE pragma and newtype wrappers prevent inlining

[GHC]

#16254: INLINABLE pragma and newtype wrappers prevent inlining
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        Reporter:  monoidal          |                Owner:  monoidal
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #5327             |  Differential Rev(s):
       Wiki Page:                    |  https://gitlab.haskell.org/ghc/ghc/merge_requests/247
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Comment (by simonpj):

 Hmm.  I wonder why?   I'd expect Size's wrapper to be inlined even inside
 the INLINEABLE unfolding.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16254#comment:6>
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