RFR: 8273021: C2: Improve Add and Xor ideal optimizations [v5]

[Yi Yang]

On Fri, 10 Sep 2021 07:45:01 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> Yi Yang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   change
>
> Thanks for making these changes. Looks good.

Thanks @TobiHartmann and @theRealELiu for reviews.

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PR: https://git.openjdk.java.net/jdk/pull/5266