RFR: 8356328: Some C2 IR nodes miss size_of() function [v2]

[Tobias Hartmann]

On Thu, 8 May 2025 12:01:58 GMT, kuaiwei <duke at openjdk.org> wrote:

>> Ah, I see that Christian already asked that :)
>
> I checked some nodes. `cmp/hash` are not always updated for new fields. It looks "nice to have". I have added `cmp/hash` for “EncodeISOArrayNode/ClearArrayNode/OpaqueMultiversioningNode" .

Thanks for doing that but it's not only nice to have, right? GVN might otherwise incorrectly common two different nodes.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25081#discussion_r2079603397