[lilliput-jdk17u:lilliput] RFR: 8308411: [Lilliput/JDK17] Cherry-pick: 8283710: JVMTI: Use BitSet for object marking [v3]

[Roman Kennke]

> This ports the original https://github.com/openjdk/jdk/pull/7964 to Lilliput/JDK17. It also includes the follow-up (cosmetic) fixes https://bugs.openjdk.org/browse/JDK-8284687 and https://bugs.openjdk.org/browse/JDK-8284725.
> 
> Testing:
>  - [x] tier1
>  - [x] serviceability/jvmti
>  - [x] vmTestbase/nsk/jvmti

Roman Kennke has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:

 - Merge branch 'lilliput' into JDK-8308411
 - Merge branch 'lilliput' into JDK-8308411
 - Some follow-ups
 - 8283710: JVMTI: Use BitSet for object marking
   
   Reviewed-by: stuefe, coleenp
 - 8283710: JVMTI: Use BitSet for object marking
   
   Reviewed-by: stuefe, coleenp
 - Revert

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

Changes:
  - all: https://git.openjdk.org/lilliput-jdk17u/pull/21/files
  - new: https://git.openjdk.org/lilliput-jdk17u/pull/21/files/d2d6123e..8e243dc2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=lilliput-jdk17u&pr=21&range=02
 - incr: https://webrevs.openjdk.org/?repo=lilliput-jdk17u&pr=21&range=01-02

  Stats: 1131 lines in 58 files changed: 735 ins; 133 del; 263 mod
  Patch: https://git.openjdk.org/lilliput-jdk17u/pull/21.diff
  Fetch: git fetch https://git.openjdk.org/lilliput-jdk17u.git pull/21/head:pull/21

PR: https://git.openjdk.org/lilliput-jdk17u/pull/21