RFR: 8260643: Remove parallel version handling in CardTableRS::younger_refs_in_space_iterate()

[Thomas Schatzl]

On Mon, 1 Feb 2021 15:32:53 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

>> Hi all,
>> 
>>   can I have reviews for this change that removes parallel handling in `CardTableRS::younger_refs_in_space_iterate` as it is always called with n_threads <= 1, making the parallel code handling there obsolete. 
>> 
>> A larger cleanup of `CardTableRS` will follow in JDK-8234534.
>> 
>> Testing:
>> tier1,2
>
> Looks good.

Thanks @kstefanj @albertnetymk for your reviews.

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PR: https://git.openjdk.java.net/jdk/pull/2333