RFR: 8327109: Refactor data graph cloning used in create_new_if_for_predicate() into separate class

[Emanuel Peter]

On Fri, 1 Mar 2024 13:58:09 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> The name could mention that we are cloning. And maybe you could do the work in the constructor, and just have accessors for the finished products, such as `_orig_to_new`.
>
> Suggestion for better name `CloneDataNodeGraph`. Do you assert that only data nodes are cloned, and no CFG nodes?

Yes, you do verify it, great!

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PR Review Comment: https://git.openjdk.org/jdk/pull/18080#discussion_r1509050744