RFR: 8318629: G1: Refine code a bit in G1RemSetTrackingPolicy::update_at_allocate [v2]

[Hamlin Li]

On Wed, 25 Oct 2023 08:06:19 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   refine code
>
> Marked as reviewed by ayang (Reviewer).

@albertnetymk @tschatzl Thanks for your reviewing.

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PR Comment: https://git.openjdk.org/jdk/pull/16300#issuecomment-1846969742