8332163: C2 SuperWord: refactor PacksetGraph and SuperWord::output into VTransformGraph

[eme64]

TODO

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Progress

• [ ] Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• [x] Change must not contain extraneous whitespace
• [x] Commit message must refer to an issue

Issue

• JDK-8332163: C2 SuperWord: refactor PacksetGraph and SuperWord::output into VTransformGraph (Enhancement - P4)

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