Hidden class names should only be accessible through 'this_class' cp entry

For a hidden class, its specified hidden name should only be accessible through the hidden class's 'this_class' constant pool entry.

The class should not be accessible by specifying its original name in, for example, a method or field signature even within the hidden class.

Note: the specified hidden name is the name passed to jvm_lookup_define_class(). The original name is the one in the class file.