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

[Amy Lu]

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