RFR: 8320052: Zero: Use __atomic built-ins for atomic RMW operations

[Aleksey Shipilev]

On Thu, 16 Nov 2023 10:24:54 GMT, David Holmes <dholmes at openjdk.org> wrote:

> The changes seem reasonable though the m68k and ARM changes don't really seem to be related to __sync built-ins.

True. I started with `__sync` -> `__atomic` replacements, but then figured we can simplify the M68K and ARM32 parts too. I renamed the issue and PR to match what is going on here better.

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PR Comment: https://git.openjdk.org/jdk/pull/16654#issuecomment-1814401757