[11][13] RFR: Request to backport October 2019 CPU changes

[Kevin Rushforth]

Hi Johan,

I request approval to backport the changes from the just-released 
January 2020 CPU to 11-dev and 13-dev.

https://cr.openjdk.java.net/~kcr/cpu-2001-sync/11-dev/webrev/

This is a straight backport (patch applies cleanly) of the four FX fixes 
that went into the January CPU. The 13-dev patches are 100% identical to 
the 11-dev, so I only posted one of them.

Thanks.

-- Kevin