RFR: 8134540: Much nearly duplicated code for PerfMemory support [v4]

[Harold Seigel]

On Tue, 19 Jan 2021 13:54:13 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Harold Seigel has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   8134540: fix AIX_ONLY typo
>
> Good.

Thanks Coleen, David, and Thomas for reviewing this change!

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PR: https://git.openjdk.java.net/jdk/pull/2037