RFR: 8364642: G1: Remove parameter in G1CollectedHeap::abandon_collection_set()

[Thomas Schatzl]

Hi all,

  please review this small refactoring to remove some parameter that `G1CollectedHeap` already knows anyway.

Testing: local compilation, gha

Thanks,
  Thomas

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Commit messages:
 - 8364642

Changes: https://git.openjdk.org/jdk/pull/26622/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26622&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364642
  Stats: 5 lines in 2 files changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/26622.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26622/head:pull/26622

PR: https://git.openjdk.org/jdk/pull/26622