[jdk20] RFR: 8297979: ZGC: Ensure consistent MemoryUsage from MemoryMXBean.getHeapMemoryUsage()

[Stefan Johansson]

…MemoryUsage()…

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Commit messages:
 - 8297979: ZGC: Ensure consistent MemoryUsage from MemoryMXBean.getHeapMemoryUsage()

Changes: https://git.openjdk.org/jdk20/pull/39/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk20&pr=39&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297979
  Stats: 6 lines in 2 files changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk20/pull/39.diff
  Fetch: git fetch https://git.openjdk.org/jdk20 pull/39/head:pull/39

PR: https://git.openjdk.org/jdk20/pull/39