[11][15] RFR: Request to backport October 2020 CPU changes

[Kevin Rushforth]

Hi Johan,

I request approval to backport the changes from the just-released 
October 2020 CPU to 11-dev (for 11.0.9) and the jfx15 branch of jfx (for 
15.0.1).

https://cr.openjdk.java.net/~kcr/cpu-2010-sync/11-dev/webrev/
https://github.com/kevinrushforth/jfx/compare/4b75750...15-cpu-2010-sync

Each is a straight backport (patch applies cleanly) of the one FX fix 
that went into the October CPU.

NOTE: For the 15.0.1 backport, since this is an integration of 
already-reviewed fixes into the jfx repo, I will push it directly into 
the jfx15 branch rather than via a pull request. The 11.0.9 backport 
will be pushed to the HG 11-dev repo.

Thanks.

-- Kevin