RFR: 8370196: C2: Improve (U)MulHiLNode::MulHiValue [v7]

[Zihao Lin]

On Sat, 22 Nov 2025 14:48:17 GMT, Zihao Lin <duke at openjdk.org> wrote:

>> If nodes both are constant, support constant folding.
>
> Zihao Lin has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix

In addition, I take some time to add a range-based folding for MulHiLNode and UMulHiLNode. Please help to take a look, thank you folks!

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PR Comment: https://git.openjdk.org/jdk/pull/28097#issuecomment-3566789337