RFR: 8298059: Linked stack watermarks don't support nesting

Tue Dec 6 09:16:26 UTC 2022

The KeepStackGCProcessedMark facility used to ensure a thread (possibly remote) remains fully processed in its scope, has not yet had to support nesting. As it turns out, they can now nest after JDK-8294924. So this patch adds support for nesting. Tested ZGC specific tests tier 1-8, general testing 1-3 and manually tested the two tests that failed and got problem listed.

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Commit messages:
 - 8298059: Linked stack watermarks don't support nesting

Changes: https://git.openjdk.org/jdk/pull/11530/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11530&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298059
  Stats: 45 lines in 4 files changed: 30 ins; 6 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/11530.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11530/head:pull/11530

PR: https://git.openjdk.org/jdk/pull/11530