RFR: 8267265: Use new IR Test Framework to create tests for C2 IGV transformations [v4]

[John Tortugo]

On Fri, 27 Aug 2021 17:59:10 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> I'm opting for having these tests in subfolders of `irTests` separated by type of optimization. But should we go with `compiler/irTests/*` or `/compiler/c2/irTests/*`?
>
> I agree to do cleanup and **correctly** separate c1/c2/shared tests (as compiler tests cleanup RFE).
> 
> If we all agree with that then the answer for last question is `/compiler/c2/irTests/*`

I moved the tests to `/compiler/c2/irTests/`. Please let me know if the split into subfolders I did is reasonable.

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