Define unit tests involving arrays of empty value types

This change defines some simple unit tests that create arrays of value
classes and null restricted value classes, where the classes have no
fields.  The objective is to ensure that allocation, assignment and
comparison of flattened arrays whose elements are of length zero does
not result in unexpected failures.

test/functional/Valhalla/src/org/openj9/test/lworld/ValueTypeArrayTests.java

@@ -668,4 +668,49 @@ static public void testValueTypeAastore() throws Throwable {
       writeArrayElementWithSomeVTClassImplIf(holder);
       writeArrayElementWithSomeIdentityClassImplIf(holder);
    }
+
+	public static primitive class EmptyPrim {
+	}
+
+	public static value class EmptyVal {
+	}
+
+	static void copyBetweenEmptyPrimArrays(EmptyPrim[] arr1, EmptyPrim[] arr2) {
+		for (int i = 0; i < arr1.length; i++) {
+			arr1[i] = arr2[i];
+		}
+	}
+
+	static void compareEmptyPrimArrays(EmptyPrim[] arr1, EmptyPrim[] arr2) {
+		for (int i = 0; i < arr1.length; i++) {
+			assertEquals(arr1[i], arr2[i]);
+		}
+	}
+
+	static void copyBetweenEmptyValArrays(EmptyVal[] arr1, EmptyVal[] arr2) {
+		for (int i = 0; i < arr1.length; i++) {
+			arr1[i] = arr2[i];
+		}
+	}
+
+	static void compareEmptyValArrays(EmptyVal[] arr1, EmptyVal[] arr2) {
+		for (int i = 0; i < arr1.length; i++) {
+			assertEquals(arr1[i], arr2[i]);
+		}
+	}
+
+	@Test(priority=1,invocationCount=2)
+	static public void testEmptyValueArrayElement() {
+		EmptyPrim[] primArr1 = new EmptyPrim[4];
+		EmptyPrim[] primArr2 = new EmptyPrim[4];
+
+		copyBetweenEmptyPrimArrays(primArr1, primArr2);
+		compareEmptyPrimArrays(primArr1, primArr2);
+
+		EmptyVal[] valArr1 = new EmptyVal[4];
+		EmptyVal[] valArr2 = new EmptyVal[4];
+
+		copyBetweenEmptyValArrays(valArr1, valArr2);
+		compareEmptyValArrays(valArr1, valArr2);
+	}
 }