RFR: 8348423: [TestBug] stress test Nodes initialization from a background thread [v3]

[Andy Goryachev]

> Created a test that validates various Nodes can be initialized in a background thread.

Andy Goryachev has updated the pull request incrementally with one additional commit since the last revision:

  fast loop

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1690/files
  - new: https://git.openjdk.org/jfx/pull/1690/files/d1356dce..e0b30334

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1690&range=02
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1690&range=01-02

  Stats: 38 lines in 1 file changed: 36 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jfx/pull/1690.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1690/head:pull/1690

PR: https://git.openjdk.org/jfx/pull/1690