RFR: 8274851: [PPC64] Port zgc to linux on ppc64le [v2]

[Magnus Ihse Bursie]

On Thu, 7 Oct 2021 08:27:47 GMT, Niklas Radomski <nradomski at openjdk.org> wrote:

>> Port the Z garbage collector ([JDK-8209683](https://bugs.openjdk.java.net/browse/JDK-8209683)) to linux on ppc64le.
>
> Niklas Radomski has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Update autoconf error message
>  - Remove copyright headers

Build changes look good now. I leave it to others to determine the actual code changes.

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Marked as reviewed by ihse (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/5842