RFR: 8293163: G1: Rename G1HeapRegionAttr::is_humongous

[Kim Barrett]

On Wed, 31 Aug 2022 09:38:40 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple renaming to avoid confusion.
> 
> Test: build

Looks good.

I suffered from the mentioned confusion for a while when reviewing JDK-8292858, so definitely appreciate this change.

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Marked as reviewed by kbarrett (Reviewer).

PR: https://git.openjdk.org/jdk/pull/10097