RFR: 8304393: Provide method to iterate over regions of humongous object in G1 [v3]

[Thomas Schatzl]

> Hi all,
> 
>   please review this refactoring that introduces a method to iterate over all regions of a humongous object and apply a function to it to decrease the five times code duplication.
> 
> Testing: gha
> 
> Thanks,
>   Thomas

Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:

  iwalulya review

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13080/files
  - new: https://git.openjdk.org/jdk/pull/13080/files/f3df2340..0ffe355e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13080&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13080&range=01-02

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/13080.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/13080/head:pull/13080

PR: https://git.openjdk.org/jdk/pull/13080