RFR: 8349213: G1: Clearing bitmaps during collection set merging not claimed by region [v3]

[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 with a new target base due to a merge or a rebase. The pull request now contains four commits:

 - Merge branch 'master' into 8349213-bitmapclear-merging-not-claiming-regions
 - * ayang review
 - * move commenty
 - 8349213: G1: Clearing bitmaps during collection set merging not claimed by region
   
   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

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

Changes: https://git.openjdk.org/jdk/pull/23419/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23419&range=02
  Stats: 12 lines in 1 file changed: 9 ins; 3 del; 0 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