RFR: 8266528: Optimize C2 VerifyIterativeGVN execution time [v3]

[Hui Shi]

On Fri, 21 May 2021 08:02:38 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> Hui Shi has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Add comments for duplicated input processing in Node::Verify
>
> Looks good to me too.

@TobiHartmann Thanks!

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PR: https://git.openjdk.java.net/jdk/pull/4045