RFR: 8327963: [Umbrella] Incorrect result of C2 compiled code since JDK-8237581

[Emanuel Peter]

On Mon, 14 Apr 2025 15:35:17 GMT, Roland Westrelin <roland at openjdk.org> wrote:

>> It would be great if we have union memory slices for this.
>
>> It would be great if we have union memory slices for this.
> 
> Something like that would fix it but it would be trickier to get right that this point fix, I think. Do you see any other use for it?

@rwestrel You should update the bug title, it just sounds too generic. It is really helpful when the "blame" history gives you a helpful comment rather than `Umbrella` or `incorrect result` or some bug numbers.

I suggest `Use NarrowMemProj to project / split memory slice after Initialize`, but you probably have an even better idea ;)

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PR Comment: https://git.openjdk.org/jdk/pull/24570#issuecomment-2824145457