RFR: 8366815: C2: Delay Mod/Div by constant transformation [v3]

[Quan Anh Mai]

On Thu, 30 Oct 2025 18:23:46 GMT, Hannes Greule <hgreule at openjdk.org> wrote:

>> The test cases show examples of code where `Value()` previously wasn't run because idealization took place before, resulting in less precise type analysis.
>> 
>> Please let me know what you think.
>
> Hannes Greule has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Since this is a transformation ordering issue, I think it is best to serialize the transformations. My proposal is to have a separate `PhaseDivConstant` that runs after some rounds of `IterGVN` and before the loop opts.

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PR Comment: https://git.openjdk.org/jdk/pull/27886#issuecomment-3506577422