RFR: 8333713: C2 SuperWord: cleanup in vectornode.cpp/hpp

[Vladimir Kozlov]

On Thu, 6 Jun 2024 11:22:24 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

> Removed dead code and renamed `superword` -> `auto_vectorization`, just like I had done in [JDK-8324750](https://bugs.openjdk.org/browse/JDK-8324750).

Good.

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Marked as reviewed by kvn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/19575#pullrequestreview-2102055077