[lworld] RFR: Merge jdk [v2]

[David Simms]

> Merge tag 'jdk-26+12' into lworld_merge_jdk_26_12
> 
> Added tag jdk-26+12 for changeset 02fe095d

David Simms has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 98 commits:

 - Compile issue with pre/post 26+12
 - Merge branch 'lworld' into lworld_merge_jdk_26_12
 - Merge jdk
   
   Merge tag 'jdk-26+12' into lworld_merge_jdk_26_12
   
   Added tag jdk-26+12 for changeset 02fe095d
 - 8364934: G1: Rename members of G1CollectionSet
   
   Reviewed-by: ayang, kbarrett
 - 8365115: G1: Refactor rem set statistics gather code for group
   
   Reviewed-by: kbarrett, ayang
 - 8364962: G1: Inline G1CollectionSet::finalize_incremental_building
   
   Reviewed-by: ayang, kbarrett
 - 8365026: G1: Initialization should start a "full" new collection set
   
   Reviewed-by: ayang, kbarrett
 - 8364414: G1: Use simpler data structure for holding collection set candidates during calculation
   
   Reviewed-by: ayang, iwalulya
 - 8364532: G1: In liveness tracing, print more significant digits for the liveness value
   
   Reviewed-by: ayang, iwalulya
 - 8364925: G1: Improve program flow around incremental collection set building
   
   Reviewed-by: ayang, iwalulya
 - ... and 88 more: https://git.openjdk.org/valhalla/compare/1a33b864...c86a40b5

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

Changes: https://git.openjdk.org/valhalla/pull/1649/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1649&range=01
  Stats: 11937 lines in 476 files changed: 6994 ins; 3176 del; 1767 mod
  Patch: https://git.openjdk.org/valhalla/pull/1649.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1649/head:pull/1649

PR: https://git.openjdk.org/valhalla/pull/1649