[GHC] #13055: Adding INLINABLE pragma causes GHC panic

[GHC]

#13055: Adding INLINABLE pragma causes GHC panic
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           Reporter:  mpickering     |             Owner:
               Type:  bug            |            Status:  new
           Priority:  high           |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 If you add an `INLINABLE` pragma to `<**>` in `GHC.Base` then `stage2`
 fails to build with an `idInfo` panic. I don't really know where to begin
 debugging this but it seems quite bad!

 Here is a build where it fails:
 https://phabricator.haskell.org/harbormaster/build/17389/
 Here is a branch with one commit with the change:
 https://github.com/ghc/ghc/tree/wip/inlinable-bug

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13055>
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