RFR: 8328350: G1: Remove DO_DISCOVERED_AND_DISCOVERY [v2]

[Guoxiong Li]

On Tue, 19 Mar 2024 14:05:42 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Remove a special ref-processing iteration mode for G1, because non-null `_discovered` field and requiring ref-discovery should never occur at the same time.
>>  
>> Test: tier1-6
>
> Albert Mingkun Yang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:
> 
>  - year
>  - g1-remove-DO_DISCOVERED_AND_DISCOVERY

Marked as reviewed by gli (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/18346#pullrequestreview-1946347752