[jdk25u-dev] RFR: 8372704: ThreadMXBean.getThreadUserTime may return total time

[Goetz Lindenmaier]

I backport this for parity with 25.0.3-oracle.

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Commit messages:
 - Backport 08c16c384ac9dac22da960ad718ceb95b41ca660

Changes: https://git.openjdk.org/jdk25u-dev/pull/100/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u-dev&pr=100&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372704
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk25u-dev/pull/100.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u-dev.git pull/100/head:pull/100

PR: https://git.openjdk.org/jdk25u-dev/pull/100