[GHC] #16058: GHC built on macOS Mojave nondeterministically segfaults

[GHC]

#16058: GHC built on macOS Mojave nondeterministically segfaults
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        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:
Operating System:  MacOS X           |         Architecture:  x86_64
 Type of failure:  Building GHC      |  (amd64)
  failed                             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 For the record I have seen this while using both `gcc` and Apple's
 `clang`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16058#comment:2>
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