[GHC] #15105: `typecheckModule` from GHC API crashes on MacOS for files with TH

[GHC]

#15105: `typecheckModule` from GHC API crashes on MacOS for files with TH
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        Reporter:  harpocrates    |                Owner:  (none)
            Type:  bug            |               Status:  new
        Priority:  high           |            Milestone:  8.6.3
       Component:  GHC API        |              Version:  8.4.2
      Resolution:                 |             Keywords:
Operating System:  MacOS X        |         Architecture:  Unknown/Multiple
 Type of failure:  Runtime crash  |            Test Case:
      Blocked By:                 |             Blocking:
 Related Tickets:                 |  Differential Rev(s):
       Wiki Page:                 |
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Changes (by bgamari):

 * priority:  normal => high
 * milestone:  8.8.1 => 8.6.3


Comment:

 Apparently
 [[https://github.com/commercialhaskell/stack/issues/3990|several others]]
 have encountered this. Bumping in priority.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15105#comment:12>
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