RFR: 8282191: Implementation of Foreign Function & Memory API (Preview) [v2]

[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 incrementally with one additional commit since the last revision:

  Address review comments
  * Use `new` instead of `fresh`
  * Drop use of `new` where caching might be used
  * Remove unused imports
  * Add static imports to make code more succint
  * Fix other typos

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7888/files
  - new: https://git.openjdk.java.net/jdk/pull/7888/files/8e6017dc..6bb1b5c9

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7888&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7888&range=00-01

  Stats: 83 lines in 10 files changed: 2 ins; 7 del; 74 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