[GHC] #15117: Add linting checks for DWARF unwind information

[GHC]

#15117: Add linting checks for DWARF unwind information
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           Reporter:  bgamari        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.2.2
           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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 DWARF unwind information is rather subtle and needs to be manually
 specified in some cases. Having at least some basic sanity checks would
 hep prevent against things like #14999.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15117>
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