javax.xml.XMLEventReader produces incorrect START_DOCUMENT event

A DESCRIPTION OF THE PROBLEM :
The default implementation of javax.xml.stream.XMLEventReader produces a StartDocument event that always indicates that the "standalone" attribute was set in the original document.

The root cause of this is that the com.sun.xml.internal.stream.events.XMLEventAllocatorImpl always set the "standalone" attribute, rather than asking streamReader.standaloneSet() before setting the property of the StartDocumentEvent being created.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
See tests that are part of PR https://github.com/openjdk/jdk/pull/1056

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
See tests that are part of PR https://github.com/openjdk/jdk/pull/1056

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Automated test is included in PR https://github.com/openjdk/jdk/pull/1056
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FREQUENCY : always