RFR: 8264774: Implementation of Foreign Function and Memory API (Incubator) [v20]

[Maurizio Cimadamore]

> This PR contains the API and implementation changes for JEP-412 [1]. A more detailed description of such changes, to avoid repetitions during the review process, is included as a separate comment.
> 
> [1] - https://openjdk.java.net/jeps/412

Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:

  Fix issue with bounded arena allocator

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3699/files
  - new: https://git.openjdk.java.net/jdk/pull/3699/files/352c287f..0c464221

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3699&range=19
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3699&range=18-19

  Stats: 112 lines in 3 files changed: 61 ins; 37 del; 14 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3699.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3699/head:pull/3699

PR: https://git.openjdk.java.net/jdk/pull/3699