RFR: 8301752: [IR Framework] Add more IR framework examples

[Christian Hagedorn]

On Fri, 3 Feb 2023 12:39:42 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

> This patch adds some more examples to the already existing IR framework usage examples. I also improved some comments.
> 
> Thanks,
> Christian

Thanks Vladimir and Tobias for your reviews!

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PR: https://git.openjdk.org/jdk/pull/12406