[jdk21u-dev] RFR: 8314831: NMT tests ignore vm flags

[Goetz Lindenmaier]

I backport this to keep the 21u test suite up-to-date. This will simplify future test backports.

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Commit messages:
 - Backport 9bf3dee2424bd8ccbc7ef0175c6e7165ff5cf1c6

Changes: https://git.openjdk.org/jdk21u-dev/pull/55/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=55&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314831
  Stats: 29 lines in 11 files changed: 11 ins; 0 del; 18 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/55.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/55/head:pull/55

PR: https://git.openjdk.org/jdk21u-dev/pull/55