RFR: 8343685: C2 SuperWord: refactor VPointer with MemPointer [v6]

[Emanuel Peter]

On Thu, 16 Jan 2025 07:00:12 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> Renamed it to `has_same_invar_summands_and_iv_scale_as`
>
> We can discuss the general `invariant` vs `invar` offline.

Discussed offline: we could file an RFE if someone is struggling with it in the future

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PR Review Comment: https://git.openjdk.org/jdk/pull/21926#discussion_r1917883455