RFR: 8272725: G1: replace type needs_remset_update_t with bool

[Albert Mingkun Yang]

On Thu, 19 Aug 2021 15:12:45 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple type change in `struct G1HeapRegionAttr`.
> 
> Test: hotspot_gc

I see; thank you for the explanation. How about I pivot this ticket/PR to adding some comment on the use of `uint8_t`?

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PR: https://git.openjdk.java.net/jdk/pull/5188