RFR: 8282191: Implementation of Foreign Function & Memory API (Preview) [v37]

[Maurizio Cimadamore]

> This PR contains the API and implementation changes for JEP-424 [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/424

Maurizio Cimadamore has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 57 commits:

 - Merge branch 'master' into foreign-preview
 - Update src/java.base/share/classes/jdk/internal/misc/X-ScopedMemoryAccess.java.template
   
   Co-authored-by: ExE Boss <3889017+ExE-Boss at users.noreply.github.com>
 - Tweak support for Linker lookup
   Improve javadoc of SymbolLookup
 - Tweak Addressable javadoc
 - Downcall and upcall tests use wrong layout which is missing some trailing padding
 - Simplify libraryLookup impl
 - Address CSR comments
 - Merge branch 'master' into foreign-preview
 - Add ValueLayout changes
 - Tweak support for array element var handle
 - ... and 47 more: https://git.openjdk.java.net/jdk/compare/af1ee1cc...41d055ab

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Changes: https://git.openjdk.java.net/jdk/pull/7888/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7888&range=36
  Stats: 65464 lines in 367 files changed: 43470 ins; 19432 del; 2562 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7888.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7888/head:pull/7888

PR: https://git.openjdk.java.net/jdk/pull/7888