RFR: 8307100: Remove ReferentBasedDiscovery reference discovery policy [v2]

[Albert Mingkun Yang]

On Tue, 2 May 2023 13:47:21 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Mostly consisting of mechanic refactoring after replacing `RefDiscoveryPolicy == ...` with `true` or `false`.
>> 
>> Test: tier1-6
>
> Albert Mingkun Yang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:
> 
>  - merge
>  - remove-referent-policy

Thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/13715#issuecomment-1537964159