RFR: 8349213: G1: Clearing bitmaps during collection set merging not claimed by region [v2]

[Thomas Schatzl]

> Hi all,
> 
>   please review this change that makes (optional) bitmap clearing during merging remembered sets claim regions. Otherwise every thread will do the (currently little) work themselves over and over again.
> 
> Testing: tier1-3
> 
> Thanks,
>   Thomas

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

  * ayang review

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/23419/files
  - new: https://git.openjdk.org/jdk/pull/23419/files/ba3a9ec7..a73b3b34

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23419&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23419&range=00-01

  Stats: 4 lines in 1 file changed: 2 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23419.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23419/head:pull/23419

PR: https://git.openjdk.org/jdk/pull/23419