RFR: 8267265: Use new IR Test Framework to create tests for C2 IGV transformations

[John Tortugo]

On Tue, 17 Aug 2021 11:15:43 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

>     * I think you should split the work into the creation of new IR tests of existing transformations (this RFE) and changing actual C2 IR transformations. I suggest to file a new RFE or bug for missing/potential wrong transformations with the corresponding IR tests for them.

I just created [this RFE](https://bugs.openjdk.java.net/browse/JDK-8272735) for the discussion/work on adjusting the Ideal transformations.

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PR: https://git.openjdk.java.net/jdk/pull/5135