[master] RFR: Merge jdk:jdk-26+5 [v2]

[Roman Kennke]

> Merging jdk-26+5
> Fixed some minor issues
> Re-order patches to make more sense and get clean builds and tests after each patch

Roman Kennke has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains four new commits since the last revision:

 - 8347710: [Lilliput] Implement 4 byte headers
   
   Reviewed-by: stuefe
 - 8320761: [Lilliput] Implement compact identity hashcode
   
   Reviewed-by: stuefe
 - 8347711: [Lilliput] Parallel GC support for compact identity hashcode
   
   Reviewed-by: stuefe
 - 8346011: [Lilliput] Compact Full-GC Forwarding
   
   Reviewed-by: stuefe

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

Changes:
  - all: https://git.openjdk.org/lilliput/pull/200/files
  - new: https://git.openjdk.org/lilliput/pull/200/files/1426d2f3..016e74cc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=lilliput&pr=200&range=01
 - incr: https://webrevs.openjdk.org/?repo=lilliput&pr=200&range=00-01

  Stats: 456 lines in 7 files changed: 234 ins; 191 del; 31 mod
  Patch: https://git.openjdk.org/lilliput/pull/200.diff
  Fetch: git fetch https://git.openjdk.org/lilliput.git pull/200/head:pull/200

PR: https://git.openjdk.org/lilliput/pull/200