RFR: 8296954: G1: Enable parallel scanning for heap region remset

Tue Nov 15 18:05:14 UTC 2022

Hi all, 

Please review this change that allows parallel scanning of a heap region's remembered set.  More balanced work load distribution in cases where are cards are unevenly distributed among remembered sets.

Testing: Tier 1-3

Thanks

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Commit messages:
 - CHT par iterate
 - fix BucketsOperation set

Changes: https://git.openjdk.org/jdk/pull/11173/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11173&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296954
  Stats: 34 lines in 8 files changed: 31 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/11173.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11173/head:pull/11173

PR: https://git.openjdk.org/jdk/pull/11173