Integrated: JDK-8260372: [PPC64] Add support for JDK-8210498 and JDK-8222841

[Niklas Radomski]

On Fri, 5 Feb 2021 18:04:34 GMT, Niklas Radomski <github.com+9200663+Quaffel at openjdk.org> wrote:

> Introduces support for _nmethod entry barriers_ and _c2i entry barriers_ on the ppc platform. Those are required to enable concurrent class unloading for compatible garbage collectors, such as Shenandoah or zGC.
> 
> _This is a preparational change for the Shenandoah GC port to ppc. As such, it introduces features that the current version doesn't make use of, but that are required for the upcoming change. This way, the scope of the upcoming change is limited to Shenandoah-specific functionality; making its review a little easier._

This pull request has now been integrated.

Changeset: 906facab
Author:    Quaffel <niklas.radomski at sap.com>
Committer: Martin Doerr <mdoerr at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/906facab
Stats:     264 lines in 10 files changed: 254 ins; 0 del; 10 mod

8260372: [PPC64] Add support for JDK-8210498 and JDK-8222841

Reviewed-by: mdoerr, goetz

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PR: https://git.openjdk.java.net/jdk/pull/2432