RFR: 8261008: Optimize Xor

[Eric Liu]

On Mon, 1 Mar 2021 10:40:51 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> Just wondering, why is `x ^ x` special? Shouldn't we then also optimize `x - x`, `x | x` and others? 

I found this case by accident and didn't notice that other node might share the same problem. I suppose they would also bring some benifits without much effort.

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PR: https://git.openjdk.java.net/jdk/pull/2776