RFR: 8295044: Implementation of Foreign Function and Memory API (Second Preview) [v15]

[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 incrementally with one additional commit since the last revision:

  Rename isOwnedBy -> isCloseableBy
  Fix minor typos
  Fix StrLenTest/RingAllocator

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10872/files
  - new: https://git.openjdk.org/jdk/pull/10872/files/df29e6a0..2d75f954

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10872&range=14
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10872&range=13-14

  Stats: 11 lines in 3 files changed: 2 ins; 0 del; 9 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