[GHC] #15332: lintIdUnfolding could be simpler

[GHC]

#15332: lintIdUnfolding could be simpler
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           Reporter:  mpickering     |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.4.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):  Phab:D4919     |         Wiki Page:
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 I think that `lintIdUnfolding` could use `maybeUnfoldingTemplate` rather
 than the complicated linting of `DFunUnfolding`. Seeing as
 `maybeUnfoldingTemplate` is the thing which is used when inlining, it
 makes sense to use that rather than some ad-hoc reconstruction.

 See https://phabricator.haskell.org/D4919 for the patch

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15332>
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