[lworld] RFR: Merge jdk

[David Simms]

Merge tag 'jdk-26+12' into lworld_merge_jdk_26_12

Added tag jdk-26+12 for changeset 02fe095d

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Commit messages:
 - Merge jdk
 - 8364934: G1: Rename members of G1CollectionSet
 - 8365115: G1: Refactor rem set statistics gather code for group
 - 8364962: G1: Inline G1CollectionSet::finalize_incremental_building
 - 8365026: G1: Initialization should start a "full" new collection set
 - 8364414: G1: Use simpler data structure for holding collection set candidates during calculation
 - 8364532: G1: In liveness tracing, print more significant digits for the liveness value
 - 8364925: G1: Improve program flow around incremental collection set building
 - 8364650: G1: Use InvalidCSetIndex instead of UINT_MAX for "invalid" sentinel value of young_index_in_cset
 - 8365910: [BACKOUT] Add a compilation timeout flag to catch long running compilations
 - ... and 86 more: https://git.openjdk.org/valhalla/compare/29df705a...a45ea3e2

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - lworld: https://webrevs.openjdk.org/?repo=valhalla&pr=1649&range=00.0
 - jdk: https://webrevs.openjdk.org/?repo=valhalla&pr=1649&range=00.1

Changes: https://git.openjdk.org/valhalla/pull/1649/files
  Stats: 11936 lines in 476 files changed: 6994 ins; 3176 del; 1766 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