RFR: 8330694: Rename 'HeapRegion' to 'G1HeapRegion' [v11]

[Thomas Schatzl]

On Sun, 12 May 2024 06:01:27 GMT, Lei Zaakjyu <duke at openjdk.org> wrote:

>> follow up 8267941
>
> Lei Zaakjyu has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix

I'm good with leaving the `heapRegionIterator()` method name as is, but please make sure that @plummercj is good with this too.

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Marked as reviewed by tschatzl (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/18871#pullrequestreview-2052094846