RFR: Merge openjdk/jdk:master [v2]

[William Kemper]

> Sync up with upstream

William Kemper has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 176 commits:

 - Merge branch 'shenandoah-master' into upstream-merge-test
 - Fix budgeting assertion
   
   Reviewed-by: wkemper
 - Handle old, pinned regions
   
   Reviewed-by: ysr, kdnilsen
 - Include old humongous start regions when counting immediate garbage
   
   Reviewed-by: ysr, kdnilsen
 - Merge openjdk/jdk:master
   
   Reviewed-by: rkennke
 - Merge tag 'jdk-20+12' into upstream-merge-test
   
   Added tag jdk-20+12 for changeset 7b81a9c7
 - Merge tag 'jdk-20+9' into upstream-merge-test
   
   Added tag jdk-20+9 for changeset 13f0f126
 - Merge branch 'shenandoah-master' into upstream-merge-test
 - Load balance remembered set scanning
   
   Reviewed-by: wkemper
 - Merge branch 'shenandoah-master' into upstream-merge-test
 - ... and 166 more: https://git.openjdk.org/shenandoah/compare/7b81a9c7...ef4ddacf

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Changes: https://git.openjdk.org/shenandoah/pull/161/files
 Webrev: https://webrevs.openjdk.org/?repo=shenandoah&pr=161&range=01
  Stats: 14619 lines in 141 files changed: 13399 ins; 485 del; 735 mod
  Patch: https://git.openjdk.org/shenandoah/pull/161.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah pull/161/head:pull/161

PR: https://git.openjdk.org/shenandoah/pull/161