[jdk11u-dev] RFR: 8207200: Committed > max memory usage when getting MemoryUsage

[Andrew Lu]

I backport this for parity with 11.0.22-oracle.

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Commit messages:
 - Backport db7b4e20e1f75f6b78c8827aa5f8ccfd842f01ab

Changes: https://git.openjdk.org/jdk11u-dev/pull/2281/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2281&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8207200
  Stats: 566 lines in 19 files changed: 177 ins; 167 del; 222 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2281.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2281/head:pull/2281

PR: https://git.openjdk.org/jdk11u-dev/pull/2281