RFR(XS) 8130183: InnerClasses: VM permits wrong inner_class_info_index value of zero

[harold seigel]

Hi,

Please review this small change to fix bug JDK-8130183.  The JVM allows 
the InnerClasses attributes inner_class_info_index to have the value of 
zero.  This violates JVM-Spec 8.  See 
http://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.6.

The fix ensures that the inner_class_info_index is non-zero and is a 
valid index into the constant pool.

Open Webrev: http://cr.openjdk.java.net/~hseigel/bug_8130183/

JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8130183

The fix was tested with JCL Lang and VM tests, the UTE quick and 
split_verifier tests, and the hotspot, java/io, java/lang, and java/util 
JTreg tests.

Thanks, Harold