Javassist cannot compile super.m() if m is a default method
declared in an interface.

It has been fixed by the previous commit, though.

did minor refactoring.

If foo.Bar.Baz is a nested class in foo.Bar, then the argument of
@MyAnnotation(foo.bar.Baz.class) could not be obtained.
The test code is javassist.JvstTest4#testAnnArg().

Static methods on interfaces in Java 8 means
that the INVOKESTATIC opcode can sometimes refer
to an item that is an InterfaceMethodrefInfo
(instead of a MethodrefInfo).

This is now handled in the
ConstPool.getMethodref...() methods by casting
to MemberrefInfo instead (since MemberrefInfo
contains all the needed information).