[master] RFR: Merge jdk [v2]

[Roman Kennke]

> Merge upstream jdk-20+8

Roman Kennke has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 65 commits:

 - Merge tag 'jdk-20+8' into merge-jdk-20+8
   
   Added tag jdk-20+8 for changeset c1040897
 - 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
 - Merge tag 'jdk-19+14'
   
   Added tag jdk-19+14 for changeset 08cadb47
 - ... and 55 more: https://git.openjdk.org/lilliput/compare/c1040897...3d54f6ac

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Changes: https://git.openjdk.org/lilliput/pull/53/files
 Webrev: https://webrevs.openjdk.org/?repo=lilliput&pr=53&range=01
  Stats: 6164 lines in 209 files changed: 4802 ins; 779 del; 583 mod
  Patch: https://git.openjdk.org/lilliput/pull/53.diff
  Fetch: git fetch https://git.openjdk.org/lilliput pull/53/head:pull/53

PR: https://git.openjdk.org/lilliput/pull/53