RFR: 8266821: G1: Prefetch cards during merge heap roots phase [v2]

[Thomas Schatzl]

On Wed, 12 May 2021 14:18:54 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   kbarrett review
>
> lgtm!

Thanks @walulyai @kimbarrett for your reviews.

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PR: https://git.openjdk.java.net/jdk/pull/3975