RFR: 8272725: G1: replace type needs_remset_update_t with bool

[Kim Barrett]

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

A comment describing the rationale for the specific types might have been nice.  I think there might have been something there in the past, but maybe removed with SPARC support.  But I agree that this is a place where we really do care about low-level control.

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