RFR: 8314119: G1: Fix -Wconversion warnings in G1CardSetInlinePtr::card_pos_for

[Albert Mingkun Yang]

On Thu, 10 Aug 2023 14:59:39 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple type change to avoid narrowing-conversion.

Thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/15228#issuecomment-1677122622