This is the implementation task for `JEP 490: ZGC: Remove the Non-Generational Mode`. See the JEP for details. [JDK-8335850](https://bugs.openjdk.org/browse/JDK-8335850)
------------- Commit messages: - Remove XCollectedHeap from HSDB - Fix typo in TestZUncommitEvent.java - Add missing problem-listing - Remove x from jdk.hotspot.agent - 8341692: Implement JEP 490: ZGC: Remove the Non-Generational Mode Changes: https://git.openjdk.org/jdk/pull/21401/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21401&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8341692 Stats: 39423 lines in 406 files changed: 152 ins; 39003 del; 268 mod Patch: https://git.openjdk.org/jdk/pull/21401.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/21401/head:pull/21401 PR: https://git.openjdk.org/jdk/pull/21401
