[lworld] RFR: Merge jdk

[David Simms]

Merge jdk-27+6

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Commit messages:
 - Merge branch 'lworld' into lworld_merge_jdk_27_6
 - Valhalla follow up for 8341630
 - Merge tag 'jdk-27+6' into lworld_merge_jdk_27_6
 - 8375458: Check legal folder of JDK image for unwanted files
 - 8375978: G1: Convert G1Policy to use Atomic<T>
 - 8375977: G1: Convert JVMCICleaningTask to use Atomic<T>
 - 8375618: Incorrect assert in CastLLNode::Ideal
 - 8375616: G1: Convert G1BatchedTask to use Atomic<T>
 - 8375314: Parallel: Crash iterating over unloaded classes for ObjectCountAfterGC event
 - 8375534: Debug method 'pp' should support compressed oops
 - ... and 86 more: https://git.openjdk.org/valhalla/compare/5c2c8f5e...913405e3

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - lworld: https://webrevs.openjdk.org/?repo=valhalla&pr=2019&range=00.0
 - jdk: https://webrevs.openjdk.org/?repo=valhalla&pr=2019&range=00.1

Changes: https://git.openjdk.org/valhalla/pull/2019/files
  Stats: 13038 lines in 360 files changed: 8115 ins; 1842 del; 3081 mod
  Patch: https://git.openjdk.org/valhalla/pull/2019.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2019/head:pull/2019

PR: https://git.openjdk.org/valhalla/pull/2019