RFR(JDK 12/java.xml) 8213117: adoptNode corrupts attribute values

[Joe Wang]

Hi,

Please review a fix for the adoptNode impl. Before a node from a 
deferred DOM can be adopted, it needs to be fully expanded.

JBS: https://bugs.openjdk.java.net/browse/JDK-8213117
webrev: http://cr.openjdk.java.net/~joehw/jdk12/8213117/webrev/

Thanks,
Joe