RFR 8214345: Infinite recursion with checking of class bound

[B. Blaser]

Hi,

Please review the following fix for [1] which simply checks only valid
class bounds per JLS 8.1.4/5:

http://cr.openjdk.java.net/~bsrbnd/jdk8214345/webrev.00/

Thanks (tier1 is OK),
Bernard

[1] https://bugs.openjdk.java.net/browse/JDK-8214345