RFR: 8373513: C2: Move ProjNode::other_if_proj() to IfProjNode [v2]

[Christian Hagedorn]

On Fri, 12 Dec 2025 13:55:02 GMT, Roland Westrelin <roland at openjdk.org> wrote:

>> Christian Hagedorn has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
>> 
>>  - Fix nullptr
>>  - Merge branch 'master' into JDK-8373513
>>  - 8373513: C2: Move ProjNode::other_if_proj() to IfProjNode
>
> Looks good to me.

Thanks @rwestrel and @eme64 for your reviews!

I pushed another update due to wrongly calling `as_IfProj()` on an actual nullptr.

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PR Comment: https://git.openjdk.org/jdk/pull/28785#issuecomment-3664502187