RFR: 8367158: C2: create better fill and copy benchmarks, taking alignment into account

[Emanuel Peter]

On Wed, 26 Nov 2025 06:49:24 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> Same applies elsewhere in the bench
>
> Good idea! Though I think in all call sites of `offsetLoad` we know that `i` is positive, so I suspect that this is already enough.

I can also do "shift and mask" for `offsetStore`. Though I would expect C2 to do the transformation already as well here too.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27315#discussion_r2563553425