RFR: 8375437: G1: Convert G1EvacFailureRegions to use Atomic<T>

[Thomas Schatzl]

Hi all,

  please review the conversion of `G1EvacFailureRegions` to use `Atomic<T>` instead of `AtomicAccess`. Nothing particularly unusual with this change I believe.

Testing: gha

Thanks,
  Thomas

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Commit messages:
 - 8375437

Changes: https://git.openjdk.org/jdk/pull/29275/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29275&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8375437
  Stats: 12 lines in 3 files changed: 4 ins; 2 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/29275.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29275/head:pull/29275

PR: https://git.openjdk.org/jdk/pull/29275