RFR: 8330694: Rename 'HeapRegion' to 'G1HeapRegion' [v6]

[Thomas Schatzl]

On Fri, 3 May 2024 06:21:54 GMT, Lei Zaakjyu <duke at openjdk.org> wrote:

>> And here also it seems you agreed with this suggestion but the change was never made.
>
> I think we can make these changes in later PRs in order to avoid making this one even larger.

As mentioned earlier, I also think the SA changes should be done here in this CR since they are fairly minor and related to single methods, so not as encapsulated as changes to the remaining class names (for which I already created an RFR https://bugs.openjdk.org/browse/JDK-8331385).

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PR Review Comment: https://git.openjdk.org/jdk/pull/18871#discussion_r1588800658