RFR: 8345119: Some java/foreign tests wrongly assume aligned memory

[Maurizio Cimadamore]

On Wed, 27 Nov 2024 16:12:04 GMT, Quan Anh Mai <qamai at openjdk.org> wrote:

> Hi,
> 
> This patch resolves some issues I found that the tests wrongly assume sufficient alignment from the segment returned by `Arena::allocate`.
> 
> Please take a look and leave your reviews, thanks a lot.

Looks good. Normally, what `Arena::allocate` does is to use `malloc` which will always align to 16 bytes in 64-bit systems, but it's good to make the tests more robust.

Marked as reviewed by mcimadamore (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/22415#pullrequestreview-2465774638
PR Review: https://git.openjdk.org/jdk/pull/22415#pullrequestreview-2465774852