This PR make s390x to adapt the changes done in [JDK-8276901](https://bugs.openjdk.org/browse/JDK-8276901) OR implements UseHeavyMonitors.
[JDK-8291555](https://bugs.openjdk.org/browse/JDK-8291555) still needs Porting effort. As for `LM_LIGHTWEIGHT` locking mode, code is Unimplemented. ------------- Commit messages: - s390x Port Changes: https://git.openjdk.org/jdk/pull/13978/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13978&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8278411 Stats: 97 lines in 5 files changed: 25 ins; 1 del; 71 mod Patch: https://git.openjdk.org/jdk/pull/13978.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/13978/head:pull/13978 PR: https://git.openjdk.org/jdk/pull/13978
