RFR: 8274069: Clean up g1ParScanThreadState a bit [v2]

[Thomas Schatzl]

On Tue, 21 Sep 2021 14:23:16 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   ayang review, renaming
>
> The old name, `enqueue_card_after_barrier_filters`, is still referenced in the comments.
> 
> (I also wonder if it makes sense to unify all callers of `enqueue_card_if_tracked` to use `write_ref_field_post` with template non-type arguments. Not in *this* PR ofc.)

Thanks @albertnetymk @kstefanj @kimbarrett for your reviews.

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PR: https://git.openjdk.java.net/jdk/pull/5607