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

[Kim Barrett]

> On Nov 6, 2018, at 6:16 AM, Magnus Ihse Bursie <magnus.ihse.bursie at oracle.com> wrote:
> 
> 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

Looks good.