RFR: 8326139: C2 SuperWord: split packs (match use/def packs, implemented, mutual independence) [v4]

[Vladimir Kozlov]

On Tue, 27 Feb 2024 17:14:12 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> I assume that `compiler/vectorization/TestPopulateIndex.java` IR test passed with these changes.
>
> Yes, they did. It was some of those tests that motivated the introduction of `is_populate_index`

Add comment  (your option 2.) before `!is_populate_index(` check to explain why we do check.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17848#discussion_r1504837757