8342393: Promote vector IR node sharing

[jatin-bhateja]

Extend GVN hashing to promote commutative IR sharing.

Draft version, tests to be added.

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Progress

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

Issue

• JDK-8342393: Promote vector IR node sharing (Enhancement - P4)

Reviewing

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$ git fetch https://git.openjdk.org/jdk.git pull/22863/head:pull/22863
$ git checkout pull/22863

Update a local copy of the PR:
$ git checkout pull/22863
$ git pull https://git.openjdk.org/jdk.git pull/22863/head

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$ git pr checkout 22863

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https://git.openjdk.org/jdk/pull/22863.diff

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