[lworld] RFR: Merge jdk

[David Simms]

Merge jdk-21+15
Merge branch 'lworld_merge_jdk_incr_from_21_10' into lworld_merge_jdk_21_15a

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Commit messages:
 - Merge jdk-21+15
 - Missing symbol from inline
 - Logical merge fixes, java_fields_count not available until fill_instance
 - Compilation fixes for logical merge errors
 - Merge tag 'jdk-21+15' into lworld_merge_jdk_incr_from_21_10
 - 8304134: jib bootstrapper fails to quote filename when checking download filetype
 - 8301498: Replace NULL with nullptr in cpu/x86
 - 8304089: Convert TraceDependencies to UL
 - 8294972: Convert jdk.jlink internal plugins to use the Classfile API
 - 8304657: G1: Rename set_state_empty to set_state_untracked
 - ... and 75 more: https://git.openjdk.org/valhalla/compare/8367d288...acbe4ab7

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - lworld: https://webrevs.openjdk.org/?repo=valhalla&pr=852&range=00.0
 - jdk: https://webrevs.openjdk.org/?repo=valhalla&pr=852&range=00.1

Changes: https://git.openjdk.org/valhalla/pull/852/files
  Stats: 11718 lines in 531 files changed: 6510 ins; 2399 del; 2809 mod
  Patch: https://git.openjdk.org/valhalla/pull/852.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/852/head:pull/852

PR: https://git.openjdk.org/valhalla/pull/852