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diff -up mozilla-aurora/js/src/jit/AtomicOperations.h.s390-atomic mozilla-aurora/js/src/jit/AtomicOperations.h
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--- mozilla-aurora/js/src/jit/AtomicOperations.h.s390-atomic	2016-11-15 12:22:38.000000000 +0100
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+++ mozilla-aurora/js/src/jit/AtomicOperations.h	2016-12-08 15:36:11.792439891 +0100
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@@ -341,6 +341,9 @@ AtomicOperations::isLockfree(int32_t siz
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 #  include "jit/none/AtomicOperations-ppc.h"
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 # elif defined(__aarch64__)
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 #  include "jit/arm64/AtomicOperations-arm64.h"
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+# elif defined(__s390__)
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+   // Also works with ppc atomic operations
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+#  include "jit/none/AtomicOperations-ppc.h"
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 # else
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 #  include "jit/none/AtomicOperations-none.h" // These MOZ_CRASH() always
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 # endif