RFR: 8307926: Support byte-sized atomic bitset operations

[Coleen Phillimore]

On Fri, 12 May 2023 09:57:44 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this change to add support Atomic byte-sized bitset operations.
> The existing default implementation using cmpxchg already (by accident) works
> on such values, because cmpxchg supports byte-sized operations.  Any future
> platform specializations of these operations will need to deal with this size
> too.
> 
> The changes consist of updating the requirements documentation for the
> operations and adding gtests for the newly supported size.
> 
> Testing:
> mach5 tier1-3
> GHA testing

Thank you!

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Marked as reviewed by coleenp (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13952#pullrequestreview-1424469809