[FFI/Jtreg_JDK20] Keep the downcall address alive for downcall

[ChengJin01]

The changes aim to prevent the downcall address from being
released unexpectedly by leveraging the existing code to
hold the downcall address during the downcall.

Fixes: #17524

Signed-off-by: ChengJin01 jincheng@ca.ibm.com

[ChengJin01]

The idea of the PR (updated on top of #17528) is holding the downcall address by performing acquire/release in OpenJDK when the corresponding scope is still alive, in which case Arena.close() in the process of downcall will end up with IllegalStateException as expected; otherwise, IllegalStateException is thrown out when the scope is closed when accessing the downcall address.

[ChengJin01]

The PR is verified in OpenJ9 FFI test suites & Jtreg test suites in JDK17 & 20.

Reviewer: @pshipton
FYI: @tajila

[pshipton]

jenkins compile zlinux jdk17,jdk20,jdknext

[ChengJin01]

Launched Grinders x50 jdk_foreign at https://openj9-jenkins.osuosl.org/job/Grinder/2492/ with the compiled build at https://openj9-jenkins.osuosl.org/job/Build_JDK20_s390x_linux_Personal/50/ and Grinder x5 for sanity.opendk at https://openj9-jenkins.osuosl.org/job/Grinder/2494/consoleText to see how it goes with the changes.

[pshipton]

5x x 5 https://openj9-jenkins.osuosl.org/view/Test/job/Grinder/2495/ - passed

[pshipton]

Seems https://openj9-jenkins.osuosl.org/job/Grinder/2492 has passed, although it's still archiving results.

@ChengJin01 pls create PRs for 0.39 and 0.40.

[ChengJin01]

@ChengJin01 pls create PRs for 0.39 and 0.40.

PRs are created at #17563 (0.39) and #17565 (0.40).