[jdk21u-dev] RFR: 8345684: OperatingSystemMXBean.getSystemCpuLoad() throws NPE

[Fabian Meumertzheim]

8345684: OperatingSystemMXBean.getSystemCpuLoad() throws NPE

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Commit messages:
 - Backport d7ef3ac0b7e677c4901c69ad4361b5de8408e8d3

Changes: https://git.openjdk.org/jdk21u-dev/pull/1211/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1211&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8345684
  Stats: 7 lines in 1 file changed: 5 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1211.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1211/head:pull/1211

PR: https://git.openjdk.org/jdk21u-dev/pull/1211