[master] RFR: Merge jdk [v2]

[Roman Kennke]

> I'd like to merge from upstream at tag jdk-20+17 (latest tag).
> 
> Testing:
>  - [x] tier1 (x86_64, x86_32, aarch64)
>  - [x] tier2 (x86_64, x86_32, aarch64)

Roman Kennke has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 66 commits:

 - Merge tag 'jdk-20+17' into merge-jdk-20+17
   
   Added tag jdk-20+17 for changeset 79ccc791
 - Merge jdk
   
   Reviewed-by: stuefe
 - Implement Shenandoah support
   
   Reviewed-by: zgu
 - Merge tag 'jdk-19+20' into merge-jdk-19+20
   
   Added tag jdk-19+20 for changeset 16a8ebbf
 - Relax array elements alignment
   
   Reviewed-by: stuefe
 - Merge remote-tracking branch 'jdk-upstream/master'
 - Merge remote-tracking branch 'jdk-upstream/master'
 - Simplify stable_mark() routine
   
   Reviewed-by: zgu, stuefe
 - Merge remote-tracking branch 'jdk-upstream/master'
 - Merge tag 'jdk-19+17'
   
   Added tag jdk-19+17 for changeset dd4a1bba
 - ... and 56 more: https://git.openjdk.org/lilliput/compare/79ccc791...3c14d484

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

Changes: https://git.openjdk.org/lilliput/pull/55/files
 Webrev: https://webrevs.openjdk.org/?repo=lilliput&pr=55&range=01
  Stats: 6138 lines in 209 files changed: 4813 ins; 772 del; 553 mod
  Patch: https://git.openjdk.org/lilliput/pull/55.diff
  Fetch: git fetch https://git.openjdk.org/lilliput pull/55/head:pull/55

PR: https://git.openjdk.org/lilliput/pull/55