RFR: 8268858: Determine register pressure automatically by the number of available registers for allocation [v3]

[Joshua Zhu]

On Wed, 23 Jun 2021 00:42:24 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Joshua Zhu has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Add more details in comments
>
> Testing results from tier1-3 and Xcomp are good.
> You need second review.

Thanks @vnkozlov @dean-long

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PR: https://git.openjdk.java.net/jdk/pull/4505