RFR: 8338658: New Object to ObjectMonitor mapping: s390x implementation [v2]

[Amit Kumar]

> s390x implementation of [JDK-8315884](https://bugs.openjdk.org/browse/JDK-8315884) New Object to ObjectMonitor mapping; 
> 
> Testing: 
> - tier1-test (fastdebug)
> - tier1-test with UseObjectMonitorTable (fastdebug)
> - tier1-test with UseObjectMonitorTable (release)

Amit Kumar has updated the pull request incrementally with one additional commit since the last revision:

  review comments

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/20740/files
  - new: https://git.openjdk.org/jdk/pull/20740/files/6612c429..ed9edb65

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20740&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20740&range=00-01

  Stats: 16 lines in 1 file changed: 10 ins; 1 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/20740.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20740/head:pull/20740

PR: https://git.openjdk.org/jdk/pull/20740