LoadCompiledKotlin and DescriptorSerialization tests should cover this.
KotlinClassAnnotationTest should only test that the correct annotation is
written
This helps to get rid of "repeated class_name" field in Package protobuf
message. DescriptorFinder in resolve.java uses PSI to find all classes in a
package, and the finder for built-ins just reads .kotlin_class_names file
Mikhael Bogdanov