RFR: 8256858: C2: Devirtualize PhaseIterGVN-specific methods [v2]

[Claes Redestad]

On Mon, 23 Nov 2020 19:52:58 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Some cleanups
>
> Good.

@vnkozlov @TobiHartmann - thank you for reviewing!

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PR: https://git.openjdk.java.net/jdk/pull/1385