Made 6 constants static in `Parent`. Discovered these with the Java Object Layout tool.
------------- Commit messages: - Make constants static Changes: https://git.openjdk.org/jfx/pull/1064/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1064&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8304705 Stats: 6 lines in 1 file changed: 0 ins; 0 del; 6 mod Patch: https://git.openjdk.org/jfx/pull/1064.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1064/head:pull/1064 PR: https://git.openjdk.org/jfx/pull/1064
