RFR: 8318364: Add an FFM-based implementation of harfbuzz OpenType layout [v5]

[Phil Race]

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

Phil Race has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 21 commits:

 - Merge remote-tracking branch 'upstream/master' into harfbuzz_panama
   Merge
 - indentation
 - Use new arrayElementVarHandle method
 - Merge remote-tracking branch 'upstream/master' into harfbuzz_panama
   Merge
 - remove tailing white space
 - use scaling
 - Fix windows build, remove perf. logging
 - Add test, fix bug
 - use allocateFrom
 - add offset param
 - ... and 11 more: https://git.openjdk.org/jdk/compare/9727f4bd...f6f2abf2

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Changes: https://git.openjdk.org/jdk/pull/15476/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15476&range=04
  Stats: 1371 lines in 7 files changed: 1369 ins; 0 del; 2 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