RFR: 8295044: Implementation of Foreign Function and Memory API (Second Preview) [v19]

[Maurizio Cimadamore]

> This PR contains the API and implementation changes for JEP-434 [1]. A more detailed description of such changes, to avoid repetitions during the review process, is included as a separate comment.
> 
> [1] - https://openjdk.org/jeps/434

Maurizio Cimadamore 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 49 additional commits since the last revision:

 - Merge branch 'master' into PR_20
 - Tweak preview feature description for JEP 434
 - Tweak Arena::close javadoc
 - Merge pull request #15 from minborg/test
   
   Add @apiNote to package-info
 - Add @apiNote to package-info
 - Merge pull request #16 from minborg/fix-tests2
   
   Fix failing tests
 - Fix failing tests
 - Rename isOwnedBy -> isCloseableBy
   Fix minor typos
   Fix StrLenTest/RingAllocator
 - Fix typo
 - More javadoc fixes
 - ... and 39 more: https://git.openjdk.org/jdk/compare/0ecc71f0...20ee6e8d

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/10872/files
  - new: https://git.openjdk.org/jdk/pull/10872/files/9b97bad6..20ee6e8d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10872&range=18
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10872&range=17-18

  Stats: 15095 lines in 530 files changed: 6855 ins; 6001 del; 2239 mod
  Patch: https://git.openjdk.org/jdk/pull/10872.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10872/head:pull/10872

PR: https://git.openjdk.org/jdk/pull/10872