[aarch64-port-dev ] RFR: JDK-8206975: AArch64: Fix CompareAndSwapOp when useLSE is enabled in Graal

[Zhongwei Yao]

Hi, all,

Bug:
https://bugs.openjdk.java.net/browse/JDK-8206975

Webrev:
http://cr.openjdk.java.net/~zyao/8206975/webrev.00/

This is a backport for the patch: 
  https://github.com/oracle/graal/pull/484/commits/af8e8b56b93e14bcdb808f2ca8079e9256879af1

It fixes the error when using AOT on ARMv8.1 system.

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Best regards,
Zhongwei