RFR: 8314225: SIGSEGV in JavaThread::is_lock_owned

[Kevin Walls]

Removal of JavaThread's MonitorChunks member.  This held lock information during deoptimization, but access to it is unnecessary for anything other than the deoptimization itself.

Access to it in is_lock_owned() was racy, and caused rare crashes.

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Commit messages:
 - Merge remote-tracking branch 'upstream/master' into 8314225_is_lock_owned_no_monitor_chunks_check
 - Add asserts around move_to calls
 - Merge remote-tracking branch 'upstream/master' into 8314225_is_lock_owned_no_monitor_chunks_check
 - 8314225: SIGSEGV in JavaThread::is_lock_owned

Changes: https://git.openjdk.org/jdk/pull/18940/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18940&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314225
  Stats: 77 lines in 8 files changed: 10 ins; 57 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/18940.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18940/head:pull/18940

PR: https://git.openjdk.org/jdk/pull/18940