RFR: 8318127: align_up has potential overflow [v8]

[Kim Barrett]

On Thu, 10 Oct 2024 15:12:57 GMT, Casper Norrbin <cnorrbin at openjdk.org> wrote:

>> Hi everyone,
>> 
>> The `align_up` function contained code which could potentially overflow and produce an incorrect result. This PR adds an assert to check for such.
>> 
>> Additionally, two test case that previously caused an overflow have been updated to use the highest possible values that do not trigger an overflow.
>
> Casper Norrbin has updated the pull request incrementally with one additional commit since the last revision:
> 
>   newline at eof

Looks good.

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Marked as reviewed by kbarrett (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20808#pullrequestreview-2361044111