RFR [14/java.xml] 8233686: XML transformer uses excessive amount of memory

[Joe Wang]

Please review a quick fix that reduces unnecessary object allocations.

JBS: https://bugs.openjdk.java.net/browse/JDK-8233686
webrev: http://cr.openjdk.java.net/~joehw/jdk14/8233686/webrev/

Thanks,
Joe