[GHC] #14280: Aarch64 build is broken

[GHC]

#14280: Aarch64 build is broken
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        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:  aarch64
 Type of failure:  Compile-time      |            Test Case:
  crash or panic                     |
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 Indeed modifying `settings` and `make -Cghc re2`ing seems to fix the
 issue.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14280#comment:2>
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