RFR: 8349361: C2: RShiftL should support all applicable transformations that RShiftI does [v9]

[Roland Westrelin]

On Tue, 25 Feb 2025 12:25:46 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> The transformation only happens if the amounts we shift left and right are the same. So if they are random, the transformation won't apply most of the time and, rarely, it will (because they will turn out to be the same). I'm not sure how to write an IR test then.
>
> You would not have to assert anything about the IR, just do value verification in that case.

Added in new commit. Is that what you had in mind?

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PR Review Comment: https://git.openjdk.org/jdk/pull/23438#discussion_r1973985047