[lilliput-jdk21u:lilliput] RFR: 8319724: [Lilliput] ParallelGC: Forwarded objects found during heap inspection

[Roman Kennke]

Clean backport of https://github.com/openjdk/lilliput/pull/116 to lilliput-jdk21u

-------------

Commit messages:
 - Backport 0568386e062474b1fc31e2e7106db0079ded7d76

Changes: https://git.openjdk.org/lilliput-jdk21u/pull/14/files
 Webrev: https://webrevs.openjdk.org/?repo=lilliput-jdk21u&pr=14&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319724
  Stats: 31 lines in 2 files changed: 28 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/lilliput-jdk21u/pull/14.diff
  Fetch: git fetch https://git.openjdk.org/lilliput-jdk21u.git pull/14/head:pull/14

PR: https://git.openjdk.org/lilliput-jdk21u/pull/14