RFR: 8314932: G1: Fix -Wconversion warnings for simple cases inside g1 folder [v2]

[Albert Mingkun Yang]

On Fri, 25 Aug 2023 11:34:43 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple dropping of conversions in miscellaneous places.
>> 
>> (I include all of them in one PR, because I think reviewing them requires local reasoning. There are other more complex conversions in g1 folder, which require their own PRs.)
>> 
>> Test: tier1-5
>
> 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/15413#issuecomment-1697742200