Java: Fix PR 15715 - Interface access flags

[Bryce McKinlay]

This patch fixes PR java/15715, setting the correct access modifiers for 
both inner and top-level interfaces. It also adds code to differentiate 
between the modifiers field in a classfile header and the access flags 
set as part of the "InnerClasses" attribute. Only a restricted set of 
flags are valid in the access_flags field in the top level header - see 
the JVM Spec section 4.1:

http://java.sun.com/docs/books/vmspec/2nd-edition/html/ClassFile.doc.html#74353

No testsuite regressions. OK to commit?

Bryce


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