RFR: 8346664: C2: Optimize mask check with constant offset [v3]

[Emanuel Peter]

On Thu, 23 Jan 2025 07:04:00 GMT, Matthias Ernst <duke at openjdk.org> wrote:

>> Matthias Ernst has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   (c)
>
> What's left to do here? Thanks!

@mernst-github The VM code looks good to me, and once I'm ok with the tests too, then I'll run some internal testing, and approve :)

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PR Comment: https://git.openjdk.org/jdk/pull/22856#issuecomment-2609107251