RFR: 8252752: Clear card table for old regions during scan in G1 [v2]

[Thomas Schatzl]

On Sat, 26 Sep 2020 06:50:07 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Comments by ayang, kbarrett, iwalulya
>
> Marked as reviewed by kbarrett (Reviewer).

Thanks @kimbarrett @albertnetymk @walulyai for the reviews!

-------------

PR: https://git.openjdk.java.net/jdk/pull/343