[lworld] RFR: Merge jdk

[David Simms]

Merge jdk-15+18

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

Commit messages:
 - Trailing Whitespace
 - Merge tag 'jdk-15+18' into lworld_merge
 - Merge commit '6405d75070301465824784cfdcee017095525a27' into lworld_merge
 - Merge compile fix for classesBySignature
 - Merge commit '6b7a466f7469d539159dc6dbd6b2ac945227e450' into lworld_merge
 - Merge commit '67fd181eb8e0013d4f6ad2f0862ab1f15c0d0189' into lworld_merge
 - Merge commit 'd8539a51efe379cacee4093995100bf7fe23a312' into lworld_merge
 - Merge commit 'ccd2a16c5818c1b3fdf1dc251a3c5c8ebff2c6d2' into lworld_merge
 - Merge commit '9fb91b4e9c46be4acf2e879afcb4bc189cff5b1f' into lworld_merge
 - Merge commit '25642dd30317e77bc15d36d5fa512da5fb54dad9' into lworld_merge
 - ...omitting 260 further commits.

The webrevs contain only the adjustments done while merging with regards to each parent branch:
 - lworld: https://webrevs.openjdk.java.net/valhalla/25/webrev.00.0
 - jdk: https://webrevs.openjdk.java.net/valhalla/25/webrev.00.1

Changes: https://git.openjdk.java.net/valhalla/pull/25/files
  Stats: 73955 lines in 1024 files changed: 12219 ins; 58054 del; 3682 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/25.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/25/head:pull/25

PR: https://git.openjdk.java.net/valhalla/pull/25