RFR: 8276162: Optimise unsigned comparison pattern [v3]

[Mai Đặng Quân Anh]

On Fri, 12 Nov 2021 17:30:52 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Mai Đặng Quân Anh has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - replace cmpx->Opcode() with cmpx_op
>>  - address reviews, remove checks for subtraction operatios
>
> Thank you for addressing my comments.
> 
> I am tentatively approve these changes leaving final approval and testing to @TobiHartmann

Thank @vnkozlov and @TobiHartmann for your reviews and suggestions, thank @DamonFool for your initial supports.
May I have this PR sponsored, please?

Thank you very much.

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PR: https://git.openjdk.java.net/jdk/pull/6101