RFR: 8275063: Implementation of Foreign Function & Memory API (Second incubator) [v10]

[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 with a new target base due to a merge or a rebase. The pull request now contains 17 commits:

 - Add cache for memory address var handles
 - Merge branch 'master' into JEP-419
 - Fix regression in VaList treatment on AArch64 (contributed by @nick-arm)
 - Merge branch 'master' into JEP-419
 - Fix copyright header in TestArrayCopy
 - Fix failing microbenchmarks. Contributed by @FrauBoes (thanks!)
 - * use `invokeWithArguments` to simplify new test
 - Add test for liveness check with high-aririty downcalls
   (make sure that if an exception occurs in a downcall because of liveness,
   ref count of other resources are left intact).
 - * Fix javadoc issue in VaList
   * Fix bug in concurrent logic for shared scope acquire
 - Address review comments
 - ... and 7 more: https://git.openjdk.java.net/jdk/compare/5bb1992b...9b519343

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Changes: https://git.openjdk.java.net/jdk/pull/5907/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5907&range=09
  Stats: 14497 lines in 189 files changed: 6773 ins; 5149 del; 2575 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