RFR: 8325252: C2 SuperWord: refactor the packset [v4]

[Emanuel Peter]

On Mon, 25 Mar 2024 11:55:07 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

>> Just specifically here, or everywhere in the code?
>
> Good question, we could probably also try to apply this renaming at other places. If it's not too much work, you can try it.

I did it in a few places, but not everywhere. Sometimes it is just easier to talk about `s1, s2` and `use1, use2` and `def1, def2` with numbers, rather than the much longer names using `left/right`.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18276#discussion_r1537552173