RFR: 8349361: C2: RShiftL should support all applicable transformations that RShiftI does [v7]

[Roland Westrelin]

On Thu, 13 Feb 2025 10:46:25 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

> I left some comments / suggestions.

Thanks for reviewing this. I pushed new commits that I think cover your comments.

> I'm also wondering about testing. How good do you think test coverage is? Are all cases covered? How about the edge-cases? Could we improve the coverage with randomization somehow?

Transformations that I refactored and now apply to both the long and int `RShift` should now have test cases. I tweaked the test cases so there are now randomized.

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PR Comment: https://git.openjdk.org/jdk/pull/23438#issuecomment-2659694153