JDK 9 RFR of JDK-8131140: Mark some tests from WhileOpStatefulTest.java and WhileOpTest.java as serialization hostile

Stream tests WhileOpStatefulTest and WhileOpTest were newly introduced in JDK-8071597, some test cases should be marked as serialization-hostile (such tests will be ignored by lambda serialization testing framework). Please review and sponsor this change: bug: https://bugs.openjdk.java.net/browse/JDK-8131140 webrev: http://cr.openjdk.java.net/~amlu/8131140/webrev.00/ Thanks, Amy