RFR: 8274615: Support relaxed atomic add for linux-aarch64 [v2]

[Kim Barrett]

On Fri, 8 Oct 2021 09:30:14 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Kim Barrett has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:
>> 
>>  - Merge branch 'master' into aarch64_touch_exp
>>  - relaxed atomic add
>
> Looks good, thanks.

Thanks @theRealAph and @dholmes-ora for reviews.

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PR: https://git.openjdk.java.net/jdk/pull/5785