[jdk24u] RFR: 8353274: [PPC64] Bug related to -XX:+UseCompactObjectHeaders -XX:-UseSIGTRAP in JDK-8305895

[Martin Doerr]

Clean backport of [JDK-8353274](https://bugs.openjdk.org/browse/JDK-8353274).

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Commit messages:
 - Backport a13e34da3f81039b572fd6030d6ee63dfffad612

Changes: https://git.openjdk.org/jdk24u/pull/178/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk24u&pr=178&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353274
  Stats: 23 lines in 2 files changed: 8 ins; 12 del; 3 mod
  Patch: https://git.openjdk.org/jdk24u/pull/178.diff
  Fetch: git fetch https://git.openjdk.org/jdk24u.git pull/178/head:pull/178

PR: https://git.openjdk.org/jdk24u/pull/178