[jdk21u-dev] RFR: 8338428: Add logging of final VM flags while setting properties

[Goetz Lindenmaier]

Resolved copyrght, probably clean.

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Commit messages:
 - backport bbd880775f73ac11dc2c86ec5b598bdb4305e699

Changes: https://git.openjdk.org/jdk21u-dev/pull/2164/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2164&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338428
  Stats: 14 lines in 2 files changed: 10 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2164.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2164/head:pull/2164

PR: https://git.openjdk.org/jdk21u-dev/pull/2164