RFR [9]: 8177036: Class.checkMemberAccess throws NPE when calling Class methods via JNI

[Claes Redestad]

Hi,

please review this fix to avoid NPEs when calling certain Class methods 
via JNI:

Bug: https://bugs.openjdk.java.net/browse/JDK-8177036
Webrev: http://cr.openjdk.java.net/~redestad/8177036/jdk.01/

Thanks!

/Claes