[GHC] #10174: AArch64 : ghc-stage2 segfaults compiling libraries/parallel

[GHC]

#10174: AArch64 : ghc-stage2 segfaults compiling libraries/parallel
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        Reporter:  erikd                |                   Owner:  erikd
            Type:  bug                  |                  Status:  new
        Priority:  normal               |               Milestone:  7.12.1
       Component:  Compiler             |                 Version:  7.11
      Resolution:                       |                Keywords:
Operating System:  Unknown/Multiple     |            Architecture:  aarch64
 Type of failure:  Building GHC failed  |               Test Case:
      Blocked By:                       |                Blocking:
 Related Tickets:                       |  Differential Revisions:
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Comment (by erikd):

 Confirmed. On Arm64, building as `quick-llvm` results in a `ghc-stage2`
 that segfaults building `libraries/parallel` but building `perf-llvm`
 works fine.

 On amd64, both `quick-llvm` and `perf-llvm` work fine.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10174#comment:6>
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