RFR: 8262185: G1: Prune collection set candidates early [v4]

[Thomas Schatzl]

On Wed, 24 Feb 2021 16:08:59 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Update src/hotspot/share/gc/g1/g1CollectionSetCandidates.cpp
>>   
>>   Co-authored-by: Stefan Johansson <54407259+kstefanj at users.noreply.github.com>
>
> Looks good =)

... and then @kstefanj also chimed in and we thought of moving the logic completely away from `G1CollectionSetCandidates` which is in spirit of the current implementation.

tier1 tested again, local testing that it works.

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PR: https://git.openjdk.java.net/jdk/pull/2693