Since the integration of [JDK-8359437](https://bugs.openjdk.org/browse/JDK-8359437) the `LockingMode` flag can no longer be set by the user. After that, a number of PRs has been integrated which has removed all `LockingMode` related code from all platforms (except from zero, which is done in this PR).
This PR removes `LockingMode` related code from the shared (non-platform specific) files. It also removes the `LockingMode` variable itself. Passes tier1-tier5 with no added problems. ------------- Commit messages: - 8365190: Remove LockingMode related code from share Changes: https://git.openjdk.org/jdk/pull/27041/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27041&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8365190 Stats: 1268 lines in 50 files changed: 6 ins; 1129 del; 133 mod Patch: https://git.openjdk.org/jdk/pull/27041.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/27041/head:pull/27041 PR: https://git.openjdk.org/jdk/pull/27041
