RFR: 8347645: C2: XOR bounded value handling blocks constant folding [v4]

[Johannes Graham]

On Thu, 23 Jan 2025 08:40:07 GMT, Quan Anh Mai <qamai at openjdk.org> wrote:

> There is no need to check `_hi` here.

If hi=0, then round_down_power_of_2(hi) would be a problem. Though if both lo and hi are 0, then it'd be a constant and wouldn't get here - is that the idea?

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PR Review Comment: https://git.openjdk.org/jdk/pull/23089#discussion_r1927263726