RFR: Merge openjdk/jdk:master [v2]

[William Kemper]

> This tag included a change to the `CardTable` (base class for `ShenandoahCardTable`) that required a couple of commits to fix up.

William Kemper has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 187 commits:

 - Do not search past last valid index for objects in clean cards
 - Remove '-1' for '+1' removed in JDK-8292912
 - Merge tag 'jdk-20+18' into upstream-merge-test
   
   Added tag jdk-20+18 for changeset 0ec18382b
 - Resolve merge issues
 - Merge branch 'shenandoah-master' into upstream-merge-test
 - Shenandoah unified logging
   
   Reviewed-by: wkemper, shade
 - Fix off-by-one error when verifying object registrations
   
   Reviewed-by: kdnilsen
 - Merge openjdk/jdk:master
 - Log rotation
   
   Reviewed-by: wkemper
 - Use only up to ConcGCThreads for concurrent RS scanning.
   
   Reviewed-by: kdnilsen, wkemper
 - ... and 177 more: https://git.openjdk.org/shenandoah/compare/0ec18382...1b8006a7

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Changes: https://git.openjdk.org/shenandoah/pull/163/files
 Webrev: https://webrevs.openjdk.org/?repo=shenandoah&pr=163&range=01
  Stats: 14378 lines in 142 files changed: 13158 ins; 486 del; 734 mod
  Patch: https://git.openjdk.org/shenandoah/pull/163.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah pull/163/head:pull/163

PR: https://git.openjdk.org/shenandoah/pull/163