PrintAst: Tie-break multiple class members created at the same source location

Otherwise Kotlin introducing a getter, setter and field declaration based on the same property tied in the sort order, and so could be output in different orders on different machines.

Author: smowton

java/ql/lib/semmle/code/java/PrintAst.qll

@@ -534,10 +534,12 @@ final class ClassInterfaceNode extends ElementNode {
     or
     childIndex >= 0 and
     result.(ElementNode).getElement() =
-      rank[childIndex](Element e, string file, int line, int column |
-        e = this.getADeclaration() and locationSortKeys(e, file, line, column)
+      rank[childIndex](Element e, string file, int line, int column, string childStr |
+        e = this.getADeclaration() and
+        locationSortKeys(e, file, line, column) and
+        childStr = result.toString()
       |
-        e order by file, line, column
+        e order by file, line, column, childStr
       )
   }
 }