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  1. JDK
  2. JDK-8224592

AArch64: Membar handling needs adjusting to support ZGC

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      ZGC adds a more than one CAS, which causes problems when the ideal graph is processed for generating ldxr, stlxr instructions.
      Roland Westerlin has supplied a fix for this issue, during this discussion:
      https://mail.openjdk.java.net/pipermail/aarch64-port-dev/2018-November/006526.html

            smonteith Stuart Monteith
            smonteith Stuart Monteith
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