RFR: 8347422: Crash during safepoint handler execution with -XX:+UseAPX

[Tobias Hartmann]

On Fri, 10 Jan 2025 13:24:21 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

> This bug fix patch fixes an internal error seen during safepoint handler execution.
> The problem occurs due to missing handling for REX2 prefixed polling test instruction.
> 
> Manually verified the patch with the -XX:+SafepointALot runtime flag.
> 
> Best Regards,
> Jatin
> PS: Patch will be opened for review after some validation.

This looks reasonable to me but I'm not an expert in this area so I leave it to someone else to approve.

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Marked as reviewed by thartmann (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23035#pullrequestreview-2556361299