[jdk17u-dev] RFR: 8275645: [JVMCI] avoid unaligned volatile reads on AArch64

[Goetz Lindenmaier]

I backport this for parity with 17.0.3-oracle.

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Commit messages:
 - Backport 4dec8fc4cc2b1762fba554d0401da8be0d6d1166

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/130/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=130&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275645
  Stats: 63 lines in 6 files changed: 41 ins; 1 del; 21 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/130.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/130/head:pull/130

PR: https://git.openjdk.java.net/jdk17u-dev/pull/130