RFR: JDK-8260372: [PPC64] Add support for JDK-8210498 and JDK-8222841 [v3]

[Niklas Radomski]

On Tue, 9 Feb 2021 08:28:59 GMT, Goetz Lindenmaier <goetz at openjdk.org> wrote:

>> Niklas Radomski has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Use toc offset in c2i entry barrier
>>  - Update comments
>
> Hi,
> I'm not that deep in this code, but looking at other platforms this looks good.
> Thanks for porting this!
> Feel free to fix the comment or push as-is ... if this is possible with this tooling :)

Thank you for your reviews!

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