RFR: 8260369: [PPC64] Add support for JDK-8200555 [v2]

[Lutz Schmidt]

On Thu, 4 Feb 2021 12:53:58 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> I'd like to add the PPC64 part of JDK-8200555 "OopHandle should use Access API". This will be required to support ShenandoahGC and zGC.
>> 
>> I have to change register usage. That's what makes this change a bit larger.
>
> Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove duplicate MacroAssembler::MacroAssembler::

LGTM

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Marked as reviewed by lucy (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2358