[jdk21] RFR: 8303279: C2: crash in SubTypeCheckNode::sub() at IGVN split if

[Christian Hagedorn]

On Thu, 13 Jul 2023 05:47:04 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> Backport of [JDK-8303279](https://bugs.openjdk.java.net/browse/JDK-8303279). Applies cleanly.
> 
> Thanks,
> Tobias

Looks good.

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Marked as reviewed by chagedorn (Reviewer).

PR Review: https://git.openjdk.org/jdk21/pull/119#pullrequestreview-1527649487