The fix to JDK-8087283, as many multiple-tree bugs after consolidation of the forest in jdk10, appears as two changesets with the same bugid. Correct way to port such a fix to jdk7 would be, to join both parts under the same original bugid (as is done in jdk8) -- but I already have pushed one part.

So under this new bugid there will be a change in
jdk/src/share/classes/com/sun/org/apache/xml/internal/security/utils/XalanXPathAPI.java belonging to JDK-8087283