RFR: 8358534: Bailout in Conv2B::Ideal when type of cmp input is not supported

[Tobias Hartmann]

On Tue, 3 Jun 2025 19:48:37 GMT, Cesar Soares Lucas <cslucas at openjdk.org> wrote:

> `Conv2BNode::ideal` segfaults in release builds when the type of `in(1)` is not INT or PTR. Creating a small test case to reproduce the issue is being a bit challenging so this PR only address the issue by bailing out of the method if the input type is unsupported. This other ticket https://bugs.openjdk.org/browse/JDK-8357885 will address creating a regression test for the problem.
> 
> Tested with JTREG tier1-3 and Renaissance on Linux x64.

Also, please don't file JBS issues (without a subcomponent) and integrate them directly. The component triaging teams should at least get a chance to properly triage the issue and set priority etc. Especially when getting close to the rampdown phases, this is required to determine if an issue is even eligible, potentially only with approval, to be fixed in the current release or needs to be deferred.

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PR Comment: https://git.openjdk.org/jdk/pull/25627#issuecomment-2938828992