[jdk21u] RFR: 8316401: sun/tools/jhsdb/JStackStressTest.java failed with "InternalError: We should have found a thread that owns the anonymous lock"

[Roman Kennke]

Hi all,

This pull request contains a backport of commit [bd918f49](https://github.com/openjdk/jdk/commit/bd918f49d29bcbc699e07b4ef8d23cfe1abd32df) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Roman Kennke on 29 Sep 2023 and was reviewed by Chris Plummer and David Holmes.

The fix relaxes an exception in the SA related to lightweight locking to print a warning instead. The fix is in mainline since end of september and has not accrued a bug-tail. Lightweight locking has been implemented in JDK21 but is not enabled by default.

Thanks!

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Commit messages:
 - Backport bd918f49d29bcbc699e07b4ef8d23cfe1abd32df

Changes: https://git.openjdk.org/jdk21u/pull/402/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=402&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316401
  Stats: 5 lines in 1 file changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u/pull/402.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/402/head:pull/402

PR: https://git.openjdk.org/jdk21u/pull/402