RFR: 8315242: G1: Fix -Wconversion warnings around GCDrainStackTargetSize [v2]

[Albert Mingkun Yang]

On Wed, 30 Aug 2023 09:49:32 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Use more precise type and range for `GCDrainStackTargetSize`.
>> 
>> The change to `TASKQUEUE_SIZE` is there, because they are used in the same `MIN2`. (All uses expect `TASKQUEUE_SIZE` to be `uint` as well.)
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/15472#issuecomment-1700718268