RFR: 8262355: Support for AVX-512 opmask register allocation. [v4]

[Jatin Bhateja]

On Fri, 5 Mar 2021 15:16:21 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

>> Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   8262355: Some synthetic changes for cleanup.
>
> It looks much better now.

Hi @iwanowww , @nsjian, please let me know if there are other comments, related to the patch or is it good to land in.

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PR: https://git.openjdk.java.net/jdk/pull/2768