RFR: 8374682: ZGC: Convert zLiveMap to use Atomic<T>

[Axel Boldt-Christmas]

Convert usages of AtomicAccess to Atomic<T> in zLiveMap.

Testing:
 * GHA
 * HotSpot GC tests with ZGC linux x64 and linux aarch64

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Commit messages:
 - Use compare_set
 - Merge remote-tracking branch 'upstream_jdk/master' into JDK-8374682
 - ZGC: Convert zLiveMap to use Atomic<T>

Changes: https://git.openjdk.org/jdk/pull/29243/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29243&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374682
  Stats: 22 lines in 3 files changed: 1 ins; 2 del; 19 mod
  Patch: https://git.openjdk.org/jdk/pull/29243.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29243/head:pull/29243

PR: https://git.openjdk.org/jdk/pull/29243