RFR: 8343774: Positiv list ir checks of compiler/c2/TestCastX2NotProcessedIGVN.java [v3]

[Richard Reingruber]

On Fri, 8 Nov 2024 15:57:37 GMT, Richard Reingruber <rrich at openjdk.org> wrote:

>> Vectorization of the loop in `test2` does not work on ppc therefore I want to exclude it there.
>
> Richard Reingruber has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove riscv64

I've converted this issue [JDK-8343774](https://bugs.openjdk.org/browse/JDK-8343774) into a subtask. In the subtask the platforms where the ir checks of `test2`  succeed are positive listed.

The issues of other platforms are tracked in the parent task.

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PR Comment: https://git.openjdk.org/jdk/pull/21975#issuecomment-2467486579