RFR: 8355230: Crash in fuzzer tests: assert(n != nullptr) failed: must not be null

[Tobias Hartmann]

On Fri, 16 May 2025 14:16:29 GMT, Roland Westrelin <roland at openjdk.org> wrote:

> During IGVN, `TypeNode::make_paths_from_here_dead()` follows data
> nodes until a `Phi`. The `Region` input for the input that that logic
> goes through to reach the `Phi` is `null` causing the crash. I propose
> simply adding an extra check for that corner case.

The test could use some simplification / cleanup but looks good to me.

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Marked as reviewed by thartmann (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/25268#pullrequestreview-2849804863