RFR[XS]: JDK-8213414 Fix incorrect copy constructors in hotspot

Tue Nov 6 11:16:33 UTC 2018

In JDK-8211073, an attempt was made to add -Wextra to hotspot. That 
patch was not accepted at the time being, but it did dig out some bugs 
in the code.

While we await JDK-8211073 to be included in the code base (so -Wextra 
is always on), we can at least fix the bugs it found in some copy 
constructors.

Bug: https://bugs.openjdk.java.net/browse/JDK-8213414
WebRev: 
http://cr.openjdk.java.net/~ihse/JDK-8213414-fix-hotspot-copy-constructors/webrev.01

/Magnus