[master] RFR: 8319185: [Lilliput] Enable and fix vectorization tests [v2]

[Roman Kennke]

On Mon, 22 Apr 2024 11:35:32 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> Seems reasonable to me, though I'm not really familiar with this test framework. If this makes the testing cleaner I'd prefer to get this integrated now instead of waiting for a perfect fix/review.

I had some discussions with Emmanuel Peter and Maurizio Cimadamore somewhere else (perhaps in the array base alignment discussions, but I don't remember, tbh), and this seemed to be the most preferable way forward. None of it is catastrophic or can be done much about, it might result in performance nuisances in some corner cases (e.g. when alignment of src and dst arrays don't match, e.g. when arraycopying from a byte[] to a long[] or such). If/when we do 4-byte-headers, the problem will disappear.

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PR Comment: https://git.openjdk.org/lilliput/pull/152#issuecomment-2069307103