RFR: Merge lworld

[Vicente Romero]

Merge branch 'lworld' into lw5

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

Commit messages:
 - Merge branch 'lworld' into merge_with_lworld
 - 8309344: [lworld] Initial ZGenerational fixes and support
 - 8312417: [lworld] Replacing NULL with nullptr in x86 code
 - 8312231: Replacing NULL with nullptr in shared code
 - 8311383: [lworld] Restoring inline class mirrors with CDS.
 - 8310651: [lworld] ValueConstantDesc fails after merge with jdk-21+25
 - 8309357: [lworld] CDS is broken with InlineKlasses after the merge

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.org/valhalla/pull/892/files
  Stats: 449 lines in 80 files changed: 43 ins; 10 del; 396 mod
  Patch: https://git.openjdk.org/valhalla/pull/892.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/892/head:pull/892

PR: https://git.openjdk.org/valhalla/pull/892