RFR: 8338658: New Object to ObjectMonitor mapping: s390x implementation [v3]

[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:

  only use z_mvghi instruction

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20740/files
  - new: https://git.openjdk.org/jdk/pull/20740/files/ed9edb65..7f78448d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20740&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20740&range=01-02

  Stats: 13 lines in 1 file changed: 0 ins; 11 del; 2 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