[jdk17u-dev] RFR: 8293547: Add relaxed add_and_fetch for macos aarch64 atomics

[Andrew Haley]

On Wed, 3 Jan 2024 18:29:27 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Clean backport to improve Atomics performance for the code that opts-in to relaxed CASes.
> 
> Additional testing:
>  - [x] macos-server-aarch64-fastdebug, `gtest:Atomic` passes
>  - [x]  macos-server-aarch64-fastdebug, `tier1`

Marked as reviewed by aph (Reviewer).

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PR Review: https://git.openjdk.org/jdk17u-dev/pull/2097#pullrequestreview-1803767904