RFR: 8297384: Add IR tests for existing idealizations of arithmetic nodes

[Zhiqiang Zang]

On Tue, 22 Nov 2022 02:23:01 GMT, Yi Yang <yyang at openjdk.org> wrote:

> Okay, I filed [JDK-8297384 Add IR tests for existing idealizations of arithmetic nodes](https://bugs.openjdk.org/browse/JDK-8297384) for this patch.

Thanks a lot! I included the issue id in this PR. Could you please help review the PR if you get a chance, thanks!

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PR: https://git.openjdk.org/jdk/pull/11049