Withdrawn: 8364407: [REDO] Consolidate Identity of self-inverse operations

[duke]

On Mon, 18 Aug 2025 15:49:48 GMT, Hannes Greule <hgreule at openjdk.org> wrote:

> The previous approach was flawed for `short` and `char` as these are int-subtypes and truncate the result (see the backout issue https://bugs.openjdk.org/browse/JDK-8364409 for a reproducer).
> 
> This change now first ensures that the input type is small enough so no truncation gets lost when dropping the operations.
> 
> The previous implementation also used an `InvolutionNode` superclass with one `Identity(...)` implementation, but there were some reservations whether this is the right way to go. As we now have a `ReverseBytesNode`, there is also less benefit in having the supertype, as this covers 4 in 1 already.
> 
> I also added test cases on top of the original ones that ensure the nodes stay when we can't prove the input type is small enough.

This pull request has been closed without being integrated.

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PR: https://git.openjdk.org/jdk/pull/26823