RFR: 8297912: HotSpot Style Guide should permit alignas (Second Proposal Attempt) [v2]

[Julian Waters]

On Thu, 8 Dec 2022 16:37:35 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Julian Waters 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 'openjdk:master' into style
>>  - HotSpot Style Guide
>
> The MSVC implementation of `ATTRIBUTE_ALIGNED` using `__declspec(align(N))` has the same
> limitation of needing the alignment value, and not being usable for types.
> 
> I happened to run into both the limitation to alignment values problem and
> the lack of an XLC definition for ATTRIBUTE_ALIGNED today.

@kimbarrett Now that alignas has officially been approved, is there anything I need to do with [8250269: Replace ATTRIBUTE_ALIGNED with alignas](https://github.com/openjdk/jdk/pull/11431)? I'm not sure if there's anything else needed on my part for that issue

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PR: https://git.openjdk.org/jdk/pull/11446