RFR: 8318364: Add an FFM-based implementation of harfbuzz OpenType layout [v3]

[Phil Race]

> 8318364: Add an FFM-based implementation of harfbuzz OpenType layout

Phil Race has updated the pull request incrementally with one additional commit since the last revision:

  Use new arrayElementVarHandle method

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15476/files
  - new: https://git.openjdk.org/jdk/pull/15476/files/984a8780..2f759caf

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15476&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15476&range=01-02

  Stats: 4 lines in 1 file changed: 0 ins; 3 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15476.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15476/head:pull/15476

PR: https://git.openjdk.org/jdk/pull/15476