dfa: report constant xor conditions only for the last operator in polyadic (IDEA-141853)

java/java-tests/testData/inspection/dataFlow/fixture/Xor.java

@@ -0,0 +1,11 @@
+import java.util.List;
+
+class Some {
+
+    public static void main(String[] args) {
+        boolean x = true, y = true, z = true, t = true;
+        boolean r = <warning descr="Condition 'x ^ y ^ z ^ t' is always 'false'">x ^ y ^ z ^ t</warning>;
+        System.out.println("r: " + r);
+    }
+
+}