RFR: 8318894: G1: Use uint for age in G1SurvRateGroup

[Albert Mingkun Yang]

On Thu, 26 Oct 2023 11:23:57 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple refactoring to use unsigned type for region-age.

Thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/16376#issuecomment-1790546201