RFR: 8295044: Implementation of Foreign Function and Memory API (Second Preview) [v3]

[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 three additional commits since the last revision:

 - Fix mismmatched acquire/release in BindingSpecializer
 - Fix MemorySegment.ofBuffer when applied to StringCharBuffer
 - Remove VM dead code after implementation of Binding.Cast

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10872/files
  - new: https://git.openjdk.org/jdk/pull/10872/files/3d933028..e8b95f83

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10872&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10872&range=01-02

  Stats: 51 lines in 6 files changed: 12 ins; 34 del; 5 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