RFR: 8275063: Implementation of Foreign Function & Memory API (Second incubator) [v13]

[Maurizio Cimadamore]

> This PR contains the API and implementation changes for JEP-419 [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/419

Maurizio Cimadamore has updated the pull request incrementally with two additional commits since the last revision:

 - Address impl review comments
 - Address API review comments

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5907/files
  - new: https://git.openjdk.java.net/jdk/pull/5907/files/7cf4fcd9..1126133a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5907&range=12
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5907&range=11-12

  Stats: 103 lines in 11 files changed: 8 ins; 23 del; 72 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5907.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5907/head:pull/5907

PR: https://git.openjdk.java.net/jdk/pull/5907