8331385: G1: Prefix HeapRegion helper classes with G1

[tschatzl]

Hi all,

after JDK-8330694 which renamed HeapRegion to G1HeapRegion, there were a few related helper classes in this CR that were not renamed.

It's purely mechanical renaming without even further renaming of files etc.

This change updates them.

(Fwiw, the "Viewed" checkbox at the top right of the file change helps a lot review this change incrementally)

Testing: tier1, tier4, tier5

Thanks, Thomas

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Progress

• [x] Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• [x] Change must not contain extraneous whitespace
• [x] Commit message must refer to an issue

Issue

• JDK-8331385: G1: Prefix HeapRegion helper classes with G1 (Enhancement - P4)

Reviewers

• Albert Mingkun Yang (@albertnetymk - Reviewer)
• David Holmes (@dholmes-ora - Reviewer)

Reviewing

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Update a local copy of the PR:
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$ git pull https://git.openjdk.org/jdk.git pull/19967/head

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$ git pr checkout 19967

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